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  • 401.
    Wiitavaara, Birgitta
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Bengs, Carita
    Sociologiska institutionen, Umeå universitet.
    Brulin, Christine
    Institutionen för omvårdnad, Umeå universitet.
    Well, I'm healthy, but...: lay perspectives on health among people with musculoskeletal disorders2016In: Disability and Rehabilitation, ISSN 0963-8288, E-ISSN 1464-5165, Vol. 38, no 1, p. 71-80Article in journal (Refereed)
    Abstract [en]

    urpose: The purpose was to investigate lay perspectives on health among people with musculoskeletal disorders. Method: Semi-structured interviews were performed with 39 women and 30 men, (aged 22–63 years) with long-term, non-specific musculoskeletal disorders in the neck, shoulder and/or low back. Data was analysed using qualitative content analysis. Results: These people experienced health as “having resources and opportunities to lead the life one wants”. Three categories, “a good enough physical and psychological functioning, freedom of action, and a positive state of emotion and an enriching life”, illustrate the different resources and opportunities that the informants described as important for them to perceive themselves as healthy. The informants also reflected on “being ill” and “being well” and what makes the difference. Five aspects influenced the dynamics of their health experiences: “body and soul, prognosis, character of symptoms, physical and social activity, and emotional state”. Consequently, the informants expressed a holistic view of health, where the focus lies on the opportunity and the ability to lead their lives the way they want. Conclusions: This study points at the value of taking lay perspectives on health into account, as it might increase the opportunity to design effective, personalized rehabilitation strategies.

  • 402.
    Wiitavaara, Birgitta
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Fahlström, Martin
    Institutionen för klinisk vetenskap, Umeå universitet.
    Djupsjöbacka, Mats
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Prevalence, diagnostics, and management of musculoskeletal disorders in primary health care in Sweden: an investigation of 2000 randomly selected patient records2017In: Journal of Evaluation In Clinical Practice, ISSN 1356-1294, E-ISSN 1365-2753, Vol. 23, no 2, p. 325-332Article in journal (Refereed)
    Abstract [en]

    Background. To improve the care of patients suffering from musculoskeletal disorders (MSD) further knowledge regarding the prevalence, diagnostics and management of different MSD in primary care is required. Thus the aims of this study were: -to investigate the prevalence of patients seeking care due to different MSD at primary health care centres (PHCs); -to chart different factors as symptoms, diagnosis, and actions prescribed for patients that visited the PHCs due to MSD; and -to make comparisons regarding differences due to gender, age, and rural or urban PHC.

    Methods. 2000 patient records for patients in working age were randomly selected equally distributed on one rural and one urban PHC. A 3-year period was reviewed retrospectively. For all patient records age, sex, occupation, occupational activity, date of visit, if it was a new or re-visit, cause to the visit, and diagnosis related to the visit were registered. For visits due to MSD the location of the patients symptoms, which symptoms were described in the patient record, the type of those symptoms, which actions were prescribed to resolve the patients problems, and also sickleave prior to and after the visit, were registered. Data was analysed using cross tabulation, multidimensional Chi-square (Pearson), and a probability level of p < .05.

    Results. The prevalence of MSD was high, almost 60 % of the patients had some sort of MSD symptoms, either at the day for visit or the reviewed 3 year period, and a bit higher among women than men. Upper and lower limb problems were most common. Symptoms were most prevalent in the young and middle age-groups. The patients got a variety of different diagnoses, and between 13-35 % of the patients did not receive a MSD-diagnose despite having MSD-symptoms. There was a great variation in how the cases were handled. Medication and sick leave certificates were most common while work-related rehabilitation was less common. Conclusion. The present study points out some weaknesses regarding diagnostics and management of MSD in primary care. Further studies to compare the results regarding diagnoses for musculoskeletal symptoms and measures taken to solve the patients’ problems would be of interest.

  • 403.
    Wiitavaara, Birgitta
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Heiden, Marina
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Content and psychometric evaluations of questionnaires for assessing physical function in people with low back disorders: a systematic review of the literature2018In: Disability and Rehabilitation, ISSN 0963-8288, E-ISSN 1464-5165Article in journal (Refereed)
    Abstract [en]

    Purpose: The purpose was to investigate how physical function is assessed in people with musculoskeletal disorders in the low back. Specifically:

    • Which questionnaires are used to assess physical function in people with musculoskeletal disorders in the low back?
    • What aspects of physical function do those questionnaires measure?
    • What are the measurement properties of the questionnaires?

    Materials and methods: A systematic review was performed to identify questionnaires and psychometric evaluations of them. The content of the questionnaires was categorised according to the International Classification of Function, Disability and Health, and the psychometric evaluations were categorised using the COnsensus-based Standards for the selection of health Measurement Instruments (COSMIN) checklist.

    Results: The questionnaires measured disability or ability to cope in everyday life, rather than physical function as such. Different aspects of a person’s mobility and ability to attend to one’s personal care were most often included regarding activity and participation. For body functions, items about sleep and pain were most often included. The Oswestry Disability Index and the Quebec Back Pain Disability Scale showed adequate psychometric properties in most evaluations.

    Conclusions: The extent of psychometric evaluations differed substantially, as did the items included. Focus of measurement was predominantly on activities in daily life.

    • Implications for rehabilitation
    • Valid and reliable instruments that measure relevant aspects of low back disorders are needed to provide early diagnostics and effective treatment.
    • Most questionnaires need more psychometric evaluations to establish the quality.
    • The Oswestry Disability Index and the Quebec Back Pain Disability Scale showed adequate psychometric properties in most evaluations.
    • The results may be useful when making decisions about which measurement instruments to use when evaluating low back disorders.
  • 404.
    Wiitavaara, Birgitta
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Heiden, Marina
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Content and psychometric evaluations of questionnaires for assessing physical function in people with neck disorders –  A systematic review of the literature2018In: Disability and Rehabilitation, ISSN 0963-8288, E-ISSN 1464-5165, Vol. 40, no 19, p. 2227-2235Article, review/survey (Refereed)
    Abstract [en]

    Purpose: The purpose was to investigate how physical function is assessed in people with musculoskeletal disorders (MSD) in the neck. Specifically, we aimed to determine: (1) Which questionnaires are used to assess physical function in people with MSD in the neck? (2) What do those questionnaires measure? (3) What are the measurement properties of the questionnaires?

    Materials and methods: A systematic review was performed to identify questionnaires and psychometric evaluations. The content of the questionnaires was categorized according to the International Classification of Function, Disability and Health, and the psychometric properties were quality-rated using the COnsensus-based Standards for the selection of health Measurement INstruments checklist.

    Results: Ten questionnaires and 32 articles evaluating measurement properties were analyzed. Most questionnaires covered only the components body functions and activity and participation, more often activity participation than body function. Internal consistency was adequate in most questionnaires, whereas responsiveness was generally low. Neck Disability Index was most evaluated, but the evaluations of all questionnaires tended to cover most properties in the checklist.

    Conclusions: The questionnaires differed substantially in items and extent to which their psychometric properties had been evaluated. Focus of measurement was on activities in daily life rather than physical function as such.

    • Implications for Rehabilitation
    • To provide early diagnostics and effective treatment for patients with neck disorders, valid and reliable instruments that measure relevant aspects of the disorders are needed.

    • This paper presents an overview of content and quality of questionnaires used to assess physical function in neck disorders, which may facilitate informed decisions about which measurement instruments to use when evaluating the course of neck disorders.

    • Most of the questionnaires need more testing to judge the quality, however the NDI was the most frequently tested questionnaire.

    • The COnsensus-based Standards for the selection of health Measurement INstruments checklist is a useful tool in relation to psychometric testing of questionnaires, but clear definitions of interpretation of the quality criteria in each study would enhance comparability of results.

  • 405.
    Wiitavaara, Birgitta
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Heiden, Marina
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Content and quality of questionnaires for assessment of physical functioning in neck disorders – A systematic review of the literature2017In: Joy at Work, NES, 2017, 2017Conference paper (Refereed)
    Abstract [en]

    Valid and reliable instruments are required in order to determine effective interventions in the treatment of musculoskeletal disorders (MSD). Today, there is a lack of consistency in use of self-report outcome measures in research and practice, which makes it difficult or impossible to compare treatment effects. The questionnaires differ widely, in content as well as quality. The focus of present study was on assessment of physical functioning among people with MSD in the neck. The aim was to investigate how physical function is assessed in people with MSD in the neck. Specifically we wanted to determine: - Which questionnaires are used to assess physical function in people with musculoskeletal disorders in the neck? - What do those questionnaires measure? - What are the measurement properties of the questionnaires?

    The study was performed as a systematic literature review in order to identify articles presenting the questionnaires and psychometric tests of them. Items included in the questionnaires were classified according to the "International Classification of Functioning, Disability and Health", ICF. Thereafter, all psychometric tests of the different questionnaires were analysed with respect to relevant quality indicators using the "Cosmin checklist".

    Included in the final analysis were 10 questionnaires and 32 articles presenting psychometric tests of them. The analysis revealed that questionnaires for measuring physical functioning in neck disorders differ substantially in items and extent to which their psychometric properties have been evaluated. Most questionnaires contained only the ICF-components body functions and activity and participation, more often activity and participation. The most psychometrically tested questionnaire was Neck Disability Index. Remaining questionnaires were tested in fewer studies and only some of the properties in the Cosmin checklist were tested for most of them.

    Questionnaires for assessment of physical function in people with neck disorders tend to focus more on the ability to engage in activities of daily life than on physical function as such. Furthermore, the measurement properties of the questionnaires have usually been evaluated in few studies. It is vital to measure aspects that are of importance for the individual wellbeing and ability to function in work and daily life when evaluating neck disorders. However, to increase the validity of the results in clinical and research studies, it is also important to include the most relevant aspects of physical function. We recommend more psychometric testing of the questionnaires, especially those that cover important aspects of the ICF categories. To ensure coverage of important aspects, validation of the questionnaires against patients and practitioners is needed.

    A review and analysis of this kind makes it easier for researchers and clinicians to select the most suitable questionnaire for their own purpose, based on the content and quality of the questionnaire.

  • 406.
    Wiitavaara, Birgitta
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Heiden, Marina
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    What do questionnaires for assessment of physical functioning in neck disorders really measure?: A systematic review of the literature2016Conference paper (Refereed)
    Abstract [en]

    Background. In order to determine which interventions are effective in the treatment of musculoskeletal disorders, valid and reliable instruments are required. However, there is a lack of consistency in the use of outcome measures, both in research and in treatment, that makes comparisons difficult or impossible; the content and quality varies widely be-tween questionnaires. This study focuses on the measurements of the physical function-ing of people with MSDs. The aim of this systematic review is to investigate how physical function is measured in people with musculoskeletal disorders or chronic pain. Specifically we want to determine: (1) What instruments are used to measure physical function in people with musculoskeletal disorders or chronic pain? (2) What do those instruments measure? (3) What is the methodological quality of these instruments?

    Method. The study was performed as a systematic literature review in the data bases PubMed, Cinahl, Web of Science, and Scopus, using the same set of keywords and Bool-ean operators. The selection of relevant articles was performed by reviewing the title and abstract first, and the article text thereafter. Selected articles were classified according to the “ICF Classification of Functioning, Disability and Health.” Subsequently, articles will be examined with respect to relevant quality indicators using the “Cosmin checklist.”

    Results. 69 relevant questionnaires were found and were sorted into groups according to focus. As a first step, neck and arm-shoulder-hand questionnaires were analyzed. The ICF-classification revealed that the included items belonged to the components “body func-tions” and “activity/participation,” and the included domains varied significantly between the questionnaires. The quality of the instruments will be determined in the next step.

    Discussion. A review and analysis of this kind makes it possible for researchers and clini-cians to more easily select the most suitable questionnaire for their purpose based on the content and quality of the questionnaire.

  • 407.
    Wiitavaara, Birgitta
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Rissén, Dag
    CFUG, Centrum för forskning och utveckling, Uppsala universitet / Landstinget Gävleborg.
    Nilsson, Annika
    University of Gävle, Faculty of Health and Occupational Studies, Department of Health and Caring Sciences, Nursing science. Institutionen för folkhälso- och vårdvetenskap, Uppsala universitet.
    Utvärdering av muskuloskeletala besvär: Utveckling av ett kliniskt användbart frågeformulär för personer med besvär från rörelseapparaten2013Other (Other academic)
  • 408. Wijk, Katarina
    et al.
    Lindberg, Per
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Divergences in descriptions of the internal work environment management, between employees and the management, a case study2013Report (Other academic)
    Abstract [en]

    The aim of the case study was to critically compare the descriptions of employees and managers of how the work environment is prioritised in a medium-sized Swedish retailer belonging to an international group. The study is based upon a questionnaire study of employees (n=55), and on interviews with people in leading positions with partial responsibility for the work environment at the company (n=6) as well as with the local safety delegate (n=1). The results show that the driving forces behind the work environment are, according to respondents, finances, legislation, trademarks and the attitudes of the upper management. The on-going work environment management is described differently in terms of its form and content by employees and persons in leading positions.

  • 409.
    Wilhelmus Johannes Andreas, G.
    et al.
    Karolinska Insitutet, Department of Neurobiology, Caring Sciences and Society, División of Physical Therapy, Sweden.
    Johansson, Elin
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Observational Methods for Assessing Ergonomic Risks for Work-Related Musculoskeletal Disorders: A Scoping Review2018In: Revista Ciencias de la Salud, ISSN 1692-7273, Vol. 16, no Special Issue, p. 8-38Article in journal (Refereed)
    Abstract [en]

    Introduction: Work-related musculoskeletal disorders (wrmsds) are one of the most common causes of absence from work. Exposures in the work environment can cause or aggravate the impact of these musculoskeletal disorders and the identification of ergonomic exposures are essential in risk assessment. It is important to assess all three key indicators of these exposures (intensity, frequency and duration) for being able to estimate the risk level for the development of wrmsds. Aim: This paper aims to give an overview of some of the observational methods that can be used for assessment of ergonomic risks at the workplace. Methods: This study was conducted as a scoping review of the medical and ergonomic literature and official governmental webpages in Sweden, U.S.A. and the Netherlands. Results: In total, 19 different observational methods were identified. We summarize our findings based on the body parts that were studied and what key indicators were assessed: 1) intensity of the work load (posture and force production), 2) frequency of the work load (e.g. repetitive movements), and 3) the duration of the work load (e.g. static work). In an appendix we include a brief presentation of these methods together with the work sheet (if available) and the source reference of the observational method. Conclusion: For ergonomists that perform risk assessments, there is a large number of observational assessment tools available and it is important to understand that different methods can be used simultaneously to be able to estimate the objective risk levels for wrmsds. © 2018, Universidad del Rosario. All rights reserved.

  • 410.
    Zetterberg, Camilla
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research. Uppsala universitet, Arbets- och miljömedicin.
    The impact of visually demanding near work on neck/shoulder discomfort and trapezius muscle activity: Laboratory studies2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Introduction: Musculoskeletal discomfort in the neck and shoulders is common among workers performing visually demanding near work, e.g., on a computer screen, and sustained low-level muscle activity during such work can lead to work-related pain. The relationships between visual demands and muscle activity and discomfort in the neck/shoulder region are at present unclear. Aim: The aims of this thesis were to determine whether neck/shoulder discomfort and trapezius muscle activity increases during visually demanding experimental near work, and to investigate whether eye-lens accommodation is a mediating mechanism behind increased trapezius muscle activity. Methods: The four papers included are based on two experiments with different visually demanding near work tasks (duration 5 and 7 min). Trial lenses of different diopters were used to manipulate the visual demands (i.e., induce more or less accommodation) and thereby create different viewing conditions. Monocular viewing, which does not require active convergence, was used to examine the isolated effect of accommodation. Eye-lens accommodation and trapezius muscle activity were measured continuously during the visual tasks, and in one experiment the participants rated their eye and neck/shoulder discomfort at baseline and after each visual task. Results: Neck/shoulder discomfort and trapezius muscle activity increased during the visually demanding near work and participants experiencing a greater increase in eye discomfort (compared with baseline) also developed more neck/shoulder discomfort with time. There were no significant differences in muscle activity among the viewing conditions, and no effect of isolated accommodation response within the monocular viewing conditions. Conclusion: These findings indicate that accommodation per se is unlikely to mediate trapezius muscle activity. Instead, the increase in trapezius muscle activity observed here may be due to a combination of high visual attention and enhanced requirement for eye-neck (head) stabilisation. Since these results suggest that neck/shoulder discomfort may aggravate with time when the visual demands are high, it is important to provide good visual conditions in connection with visually demanding occupations.

  • 411.
    Zetterberg, Camilla
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Forsman, Mikael
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
    Richter, Hans
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Effects of visually demanding near work on trapezius muscle activity2013In: Journal of Electromyography & Kinesiology, ISSN 1050-6411, E-ISSN 1873-5711, Vol. 23, no 5, p. 1190-1198Article in journal (Refereed)
    Abstract [en]

    Poor visual ergonomics is associated with visual and neck/shoulder discomfort, but the relation between visual demands and neck/shoulder muscle activity is unclear. The aims of this study were to investigate whether trapezius muscle activity was affected by: (i) eye-lens accommodation; (ii) incongruence between accommodation and convergence; and (iii) presence of neck/shoulder discomfort. Sixty-six participants (33 controls and 33 with neck pain) performed visually demanding near work under four different trial-lens conditions. Results showed that eye-lens accommodation per se did not affect trapezius muscle activity significantly. However, when incongruence between accommodation and convergence was present, a significant positive relationship between eye-lens accommodation and trapezius muscle activity was found. There were no significant group-differences. It was concluded that incongruence between accommodation and convergence is an important factor in the relation between visually demanding near work and trapezius muscle activity. The relatively low demands on accommodation and convergence in the present study imply that visually demanding near work may contribute to increased muscle activity, and over time to the development of near work related neck/shoulder discomfort.

  • 412.
    Zetterberg, Camilla
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research. Uppsala universitet, Arbets- och miljömedicin.
    Forsman, Mikael
    Institutet för miljömedicin, Karolinska Institutet, Stockholm, Sverige.
    Richter, Hans O.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Neck/shoulder discomfort due to visually demanding near work is influenced by previous neck pain, task duration, astigmatism, eye discomfort and accommodation2017In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 12, no 8, article id e0182439Article in journal (Refereed)
    Abstract [en]

    Visually demanding near work can cause eye discomfort, and eye and neck/shoulder discomfort during, e.g., computer work are associated. Here, to investigate direct effects of experimental near work on eye and neck/shoulder discomfort, 33 individuals with chronic neck pain and 33 healthy control subjects performed four visual tasks, rating eye and neck/shoulder discomfort at baseline and after each task. The cumulative performance time (reflected in the temporal order of the tasks), astigmatism, concurrent eye discomfort, and extent of accommodation all aggravated neck/shoulder discomfort. There was an interaction effect between the temporal order and eye discomfort: participants with a greater mean increase in eye discomfort also developed more neck/shoulder discomfort with time. Since moderate musculoskeletal symptoms are a risk factor for more severe symptoms, it is important to ensure a good visual environment in occupations involving visually demanding near work.

  • 413.
    Zetterberg, Camilla
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Heiden, Marina
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Lindberg, Per
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Nylén, Per
    The Swedish Work Environment Authority, and The Royal Institute of Technology.
    Hemphälä, Hillevi
    Lund University.
    Intra-rater reliability of the Visual Ergonomics Risk Assessment Method (VERAM)2018Conference paper (Refereed)
    Abstract [en]

    Introduction: Visually demanding near work can cause eye discomfort, and eye and neck/shoulder discomfort during, e.g., computer work are associated. Apart from visual demands and dryness a number of environmental factors including design of the work station, lighting, glare, and the quality of the computer screen might exert an impact on eye-related symptoms. To date, there is a lack of valid and reliable instruments assessing factors associated with eye- or visual symptoms. Therefore, a new method to assess visual ergonomics at workplaces was developed in Sweden between 2014 and 2016, the Visual Ergonomics Risk Assessment Method - VERAM. A first version of the method was drafted by the researchers mainly from existing checklists and instruments, and tested in the field by trained visual ergonomists. The method was then revised and used in the field to collect data for validity and reliability analyses. The final version of VERAM includes both a questionnaire for the employee, and an expert evaluation of the employee’s workplace. The questionnaire consists of subjective ratings in six domains: eye discomfort (frequency and intensity), musculoskeletal discomfort (frequency and intensity), ratings of visual symptoms (e.g. blurred and double vision) and ratings of the visual environment (e.g. illumination levels, glare and reflexes from a work object or a computer screen). The expert evaluation consists of both objective measurements and subjective assessments resulting in an overall expert risk assessment (no risk, low risk or high risk) of eight factors: daylight, lighting, illuminance, glare, flicker, work space, work object and work posture.

    Aim: At the IEA conference 2018 the new VERAM method will be presented together with results from intra-rater reliability analyses.

    Results: Intra-rater reliability was evaluated with a re-test interval of minimum two and maximum three weeks. 99 employees were included in the analyses and 32 visual ergonomists performed the corresponding expert evaluations. The Intraclass Correlations (ICC) were between 0.70 and 0.87 for the six subjective domains, and there were no significant systematic differences between the first and second rating for any of the subjective domains (rmANOVA, p > 0.05, α = 0.008). For the eight environmental factors the expert estimated the risk equally during the first and the second assessment in 69-92% of the cases, and, as seen for the subjective domains, there were no significant systematic differences for any of the eight factors (Wilcoxon sign rank test, p > 0.014, α = 0.006). To control for multiple comparisons the Bonferroni method was used.

    Conclusion: The Visual Ergonomics Risk Assessment Method – VERAM showed good intra-rater reliability, both for the subjective questionnaire for the employee, and for the expert evaluation of the employee’s workplace when performed by a trained visual ergonomist.

  • 414.
    Zetterberg, Camilla
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Heiden, Marina
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Lindberg, Per
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Nylén, Per
    Swedish Work Environment Authority, Stockholm, Sweden.
    Hemphälä, Hillevi
    Division of Ergonomics and Aerosol Technology, Design Sciences, Lund University, Lund, Sweden.
    Reliability of a new risk assessment method for visual ergonomics2019In: International Journal of Industrial Ergonomics, ISSN 0169-8141, E-ISSN 1872-8219, Vol. 72, p. 71-79Article in journal (Refereed)
    Abstract [en]

    Introduction

    The Visual Ergonomics Risk Assessment Method (VERAM) is a newly developed and validated method to assess visual ergonomics at workplaces. VERAM consists of a questionnaire and an objective evaluation.

    Objective

    To evaluate reliability of VERAM by assessing test-retest reliability of the questionnaire, and intra- and inter-rater reliability of the objective evaluation.

    Methods

    Forty-eight trained evaluators used VERAM to evaluate visual ergonomics at 174 workstations. The time interval for test-retest and intra-rater evaluations was 2–3 weeks, and the time interval for inter-rater evaluations was 0–2 days. Test-retest reliability was assessed by intraclass correlation (ICC), the standard error of measurement (SEM) and the smallest detectable change (SDC). Intra- and inter-rater reliability were assessed with weighted kappa coefficients and absolute agreement. Systematic changes were analysed with repeated measures analyses of variance and Wilcoxon sign rank test.

    Results

    The ICC of the questionnaire indices ranged from 0.69 to 0.87, while SEM ranged from 7.21 to 10.19 on a scale from 1 to 100, and SDC from 14.42 to 20.37. Intra-rater reliability of objective evaluations ranged from 0.57 to 0.85 (kappa coefficients) and the agreement from 69 to 91%. Inter-rater reliability of objective evaluations ranged from 0.37 to 0.72 (kappa coefficients) and the agreement from 52 to 87%.

    Conclusion

    VERAM is a reliable instrument for assessing risks in visual work environments. However, the reliability might increase further by improving the quality of training for evaluators. Complementary evaluations of VERAM's sensitivity to changes in the visual environment are needed.

    Relevance to industry

    It is advantageous to set up a work environment for maximal visual comfort to avoid negative effects on work postures and movements and thus prevent visual- and musculoskeletal symptoms. This method, VERAM, satisfies the need of a valid and reliable tool for determining risks associated with the visual work environment.

  • 415.
    Zetterberg, Camilla
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research. Department of Medical Sciences, Section of Occupational and Environmental Medicine, Uppsala University, Uppsala, Sweden..
    Hemphälä, Hillevi
    Ergonomics, Design Sciences, Lund University, Lund, Sweden.
    Nylén, Per
    The Swedish Work Environment Authority, and The Royal Institute of Technology.
    Lighting, visual ergonomics and health implications : A workshop2014Conference paper (Refereed)
    Abstract [en]

    Aim of the workshop:

    Deficient visual ergonomics is a problem across many occupations. Poor viewingand lighting conditions is associated with both visual and neck/shoulder discomfort,and can also impact productivity. According to the provision from the Swedish WorkEnvironment Authority on prevention of musculoskeletal disorders (AFS 2012:02), riskassessment of the visual conditions are mandatory. The aim of this workshop is toincrease knowledge about visual ergonomics among practitioners working with riskassessment, and to allow participants hands-on practice in assessing the visual environment.

    Format of the workshop:

    The first part of the workshop will involve a brief presentation of the subject visualergonomics and its implications on health and performance. The impact of progressiveglasses, too small or blurred font letters, or blurred vision on posture at e.g. computerwork will be demonstrated together with advice how to proceed to improve the conditions.The second part of the workshop will allow participants some hands-on practicein for example; how to measure light (luminance and illuminance); how different lightconditions impact pupil size and visual comfort; how to measure and quantify amountof flicker, light modulation and colour rendering in different light sources. Several usefulmobile phone applications concerning light and vision will be demonstrated.

  • 416.
    Zetterberg, Camilla
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Hemphälä, Hillevi
    Lund University.
    Nylén, Per
    The Swedish Work Environment Authority, and The Royal Institute of Technology.
    Workshop in visual ergonomics2013Conference paper (Refereed)
    Abstract [en]

    Increased use of computers is common across many work sectors. Prolonged near work at a computer screen is associated with both visual discomfort and neck/shoulder discomfort and pain. Inadequate visual ergonomics at a computer workstation can also influence both visual and neck/shoulder discomfort. The new provision from the Swedish Work Environment Authority on prevention of musculoskeletal disorders includes risk assessment of occupational visual conditions. These assessments require practitioners to have knowledge of the topic, as well as experience with practical assessment tools.

    The first part of the workshop proposed here will involve a presentation of the theories underlying visual ergonomic practices and a discussion of the most important factors to assess at a computer workstation. These factors include contrast, font size, resolution, glare, reflexion, non-visual flicker, and edge sharpness. The second part of the workshop, will allow participants hands-on practice in measuring and evaluating visual ergonomics at a computer workstation.

  • 417.
    Zetterberg, Camilla
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research. Department of Medical Sciences, Section of Occupational and Environmental Medicine, Uppsala University, Uppsala, Sweden..
    Richter, Hans
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Forsman, Mikael
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
    Temporal co-variation between eye lens accommodation and trapezius muscle activity during a dynamic near-far visual task2015In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 10, no 5, article id e0126578Article in journal (Refereed)
    Abstract [en]

    Near work is associated with increased activity in the neck and shoulder muscles, but the underlying mechanism is still unknown. This study was designed to determine whether a dynamic change in focus, alternating between a nearby and a more distant visual target, produces a direct parallel change in trapezius muscle activity. Fourteen healthy controls and 12 patients with a history of visual and neck/shoulder symptoms performed a Near-Far visual task under three different viewing conditions; one neutral condition with no trial lenses, one condition with negative trial lenses to create increased accommodation, and one condition with positive trial lenses to create decreased accommodation. Eye lens accommodation and trapezius muscle activity were continuously recorded. The trapezius muscle activity was significantly higher during Near than during Far focusing periods for both groups within the neutral viewing condition, and there was a significant co-variation in time between accommodation and trapezius muscle activity within the neutral and positive viewing conditions for the control group. In conclusion, these results reveal a connection between Near focusing and increased muscle activity during dynamic changes in focus between a nearby and a far target. A direct link, from the accommodation/vergence system to the trapezius muscles cannot be ruled out, but the connection may also be explained by an increased need for eye-neck (head) stabilization when focusing on a nearby target as compared to a more distant target.

  • 418.
    Zetterlund, Christina
    et al.
    Centre for Rehabilitation Research, Örebro University Hospital.
    Lundqvist, Lars-Olof
    Centre for Rehabilitation Research, Örebro University Hospital.
    Richter, Hans
    University of Gävle, Centre for Musculoskeletal Research. University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science.
    The relationship between low vision and musculoskeletal complaints: A case control study between age-related macular degeneration patients and age-matched controls with normal vision2009In: Journal of Optometry, ISSN 1888-4296, Vol. 2, no 3, p. 127-133Article in journal (Refereed)
    Abstract [en]

    Introduction: Age-related Macular Degeneration (AMD) patients often describe complaints from neck and scapula area muscles and a decreased postural control. In clinical assessment, these complaints are considered to be due to old age. Purpose: This study focuses on low vision patients with AMD, compared to age matched controls, without eye disease, in order to evaluate if a linkage between self-rated visual and muskuloskeletal complaints are more prominent when low vision is present. Methods: In a cross-sectional study, 24 AMD patients, aged 65-85 years, were compared to 24 controls of similar ages without visual problems. Visual acuity, the need for magnification plus other optical and visual data, were obtained. Visual, muskuloskeletal and balance/propriopceptive complaints were collected with a self-rating questionnaire. The Visual Functioning Questionnaire -Near Activities Subscale (VFQ-NAS) was used to evaluate visual function and related complaints. Results: The correlation coefficient between visual and musculoskeletal complaints yielded significant values when computed separately within each group as well as when calculated on the entire material (AMD ρ = 0.60, P = 0.002; control group ρ = 0.59, P = 0.004; both groups together ρ = 0.50 P < 0.001). Stepwise multiple regression analysis supported the hypothesized effect of vision (Visual complaints + Minimal readable typefaces) on musculoskeletal complaints, (R2 = 0.42, P < 0.05). Conclusions: The results in this study support the hypothesis of a relationship between visual and muskuloskeletal problems.

  • 419.
    Zetterlund, Christina
    et al.
    School of Health and Medicine, Örebro University, Örebro, Sweden.
    Lundqvist, Lars-Olov
    Centre for Rehabilitiation Research, Örebro County Council, Örebro, Sweden.
    Richter, Hans
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Visual, musculoskeletal and balance symptoms in individuals with visual impairment and with age-normal vision2019In: Clinical and experimental optometry, ISSN 0816-4622, E-ISSN 1444-0938, Vol. 102, no 1, p. 63-69Article in journal (Refereed)
    Abstract [en]

    BACKGROUND:

    Visual impairment is globally among the most prevalent disabilities. Research concerning the health consequences of visual deficits is challenged by confounding effects of age, because visual impairment becomes more prevalent with age. This study investigates the influence of visual deficits on visual, musculoskeletal and balance symptoms in adults with and without visual impairment, while controlling for age effects.

    METHODS:

    Thirty-nine patients with visual impairment, aged 18-72 years, were compared to 37 age-matched controls with normal vision, allocated to two age groups: < 45 and ≥ 45 years. Self-reported symptoms were measured using the Visual, Musculoskeletal and Balance Symptoms Questionnaire and compared with demographic and optometric variables.

    RESULTS:

    In total, patients with visual impairment reported more symptoms than age-matched normally sighted controls. Younger adults in the control group were almost free from symptoms, whereas younger adults with visual impairment reported levels of symptoms equal to older adults with visual impairment. Multiple logistic regression modelling identified use of eyeglasses, magnifying aids and presence of anisometropia to be the most influential risk factors for reporting visual, musculoskeletal and balance symptoms, with accentuated influence on balance symptoms.

    CONCLUSIONS:

    People with visual impairments and people with age-related normal visual deficits are both predisposed to report visual, musculoskeletal and balance symptoms relative to people without visual defects or need for eye-wear correction. Age-related variations in symptoms were observed in the control groups but not in the visual impairment groups, with younger visual impairment patients reporting as many symptoms as older visual impairment patients. These findings indicate a need for a wider interdisciplinary perspective on eye care concerning people with visual impairment and people with need for habitual daily use of eye wear correction.

  • 420.
    Zetterlund, Christina
    et al.
    The Low Vision Centre, Region Örebro County, Örebro, Sweden; University Health Care Research Center, Faculty of Medicine and Health, Örebro University, Örebro, Sweden; School of Health and Medical Sciences, Örebro University, Örebro, Sweden.
    Richter, Hans O.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research.
    Lundqvist, Lars-Olov
    University Health Care Research Center, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
    Visual, Musculoskeletal, and Balance Complaints in AMD: A Follow-Up Study2016In: Journal of Ophthalmology, ISSN 2090-004X, E-ISSN 2090-0058, Vol. 2016, article id 2707102Article in journal (Refereed)
    Abstract [en]

    Purpose. To investigate whether patients with age-related macular degeneration (AMD) run a potentially higher risk of developing visual, musculoskeletal, and balance complaints than age-matched controls with normal vision. Methods. Visual assessments, self-rated visual function, self-rated visual, musculoskeletal, and balance complaints, and perceived general health were obtained in 37 AMD patients and 18 controls, at baseline and after an average of 3.8 years later. Results. At follow-up both groups reported decreased visual acuity (VA) and visual function, but only AMD patients reported significantly increased visual, musculoskeletal, and balance complaints. Decreased VA, need for larger font size when reading, need for larger magnification, and decreased self-rated visual function were identified as risk markers for increased complaints in AMD patients. These complaints were also identified as risk markers for decreased health. For controls, decreased VA and self-reported visual function were associated with increased visual and balance complaints. Conclusions. Visual deterioration was a risk marker for increased visual, musculoskeletal, balance, and health complaints in AMD patients. Specifically, magnifying visual aids, such as CCTV, were a risk marker for increased complaints in AMD patients. This calls for early and coordinated actions to treat and prevent visual, musculoskeletal, balance, and health complaints in AMD patients.

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