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Is self-reported time spent sedentary and in physical activity among blue-collar workers differentially biased by age, gender, body mass index and low-back pain?
National Research Centre for the Working Environment, Copenhagen.
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.
2017 (English)In: Scandinavian Journal of Work, Environment and Health, ISSN 0355-3140, E-ISSN 1795-990XArticle in journal (Refereed) Submitted
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-vigorous physical activity (MVPA) among blue-collar workers. 

Methods. 147 workers wore an Actigraph accelerometer on the thigh for 2-4 consecutive working days to determine proportional time spent sedentary and in MVPA, 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, 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 low 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
2017.
Keyword [en]
Measurement error, exposure modelling, questionnaire, musculoskeletal pain
National Category
Environmental Health and Occupational Health
Identifiers
URN: urn:nbn:se:hig:diva-24600OAI: oai:DiVA.org:hig-24600DiVA: diva2:1117418
Available from: 2017-06-28 Created: 2017-06-28 Last updated: 2017-07-04Bibliographically approved

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