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Is self-reported time spent sedentary and in physical activity differentially biased by age, gender, body mass index and low-back pain?
National Research Centre for the Working Environment, Copenhagen, Denmark.
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.ORCID iD: 0000-0002-5055-0698
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.ORCID iD: 0000-0003-1443-6211
National Research Centre for the Working Environment, Copenhagen, Denmark; Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark .
2018 (English)In: Scandinavian Journal of Work, Environment and Health, ISSN 0355-3140, E-ISSN 1795-990X, Vol. 44, no 2, p. 163-170Article in journal (Refereed) Published
Abstract [en]

Objectives We aimed at determining the extent to which age, gender, BMI and low back pain (LBP) influence bias in self-reported sedentary behavior and moderate-to-vigorous physical activity (MVPA) among blue-collar workers. 

Methods 147 workers wore an Actigraph accelerometer on the thigh for 2-4 consecutive working days. Proportional time spent sedentary and in MVPA was determined using the Acti4 software. The same variables were also self-reported in a questionnaire. The difference between self-reported and accelerometer-based sedentary time and MVPA was calculated and linearly regressed against age, gender, BMI, and self-reported LBP intensity as main effects, as well as interaction terms combining each of these factors with objectively measured exposure.   

Results Workers objectively spent 64% of their time sedentary and 9% in MVPA. On average, self-reports underestimated sedentary time by 1.5 time percentage points and overestimated MVPA by 5.5%. Workers with mild/no LBP appeared to have the same size of self-report bias in MVPA regardless of how much MVPA they actually had, while workers with high LBP overestimated MVPA to an increasing extent with increasing exposure (interaction: B 0.29, 95%CI 0.05 to 0.53). Age was positively associated with self-report bias in sedentary time (B=0.31, 95%CI=0.09 - 0.54, P=0.008) regardless of actual sedentary time.

Conclusions LBP and age, but not BMI and gender, introduced differential bias in self-reported information on sedentary behavior and MVPA among blue-collar workers. This result suggests that bias correction in future studies based on self-reports of sedentary time and MVPA should account for LBP and age.

Place, publisher, year, edition, pages
2018. Vol. 44, no 2, p. 163-170
Keywords [en]
Measurement error, exposure modelling, questionnaire, musculoskeletal pain
National Category
Occupational Health and Environmental Health
Research subject
Health-Promoting Work
Identifiers
URN: urn:nbn:se:hig:diva-24600DOI: 10.5271/sjweh.3693ISI: 000427107100006PubMedID: 29184965Scopus ID: 2-s2.0-85042866971OAI: oai:DiVA.org:hig-24600DiVA, id: diva2:1117418
Part of project
Forte-centre Working Life: The Body at Work - from problem to potential, Forte
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-01761
Note

Funding agency: Danish Work Environment Research Fund  Grant no: 20130069161/9

Available from: 2017-06-28 Created: 2017-06-28 Last updated: 2020-11-23Bibliographically approved

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Heiden, MarinaMathiassen, Svend Erik

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