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    A comparison of standard and compositional data analysis in studies addressing group differences in sedentary behavior and physical activity

    Access Status
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    Authors
    Gupta, N.
    Mathiassen, Svend
    Mateu-Figueras, G.
    Heiden, M.
    Hallman, D.
    Jørgensen, M.
    Holtermann, A.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Gupta, N. and Mathiassen, S. and Mateu-Figueras, G. and Heiden, M. and Hallman, D. and Jørgensen, M. and Holtermann, A. 2018. A comparison of standard and compositional data analysis in studies addressing group differences in sedentary behavior and physical activity. International Journal of Behavioral Nutrition and Physical Activity. 15 (1).
    Source Title
    International Journal of Behavioral Nutrition and Physical Activity
    DOI
    10.1186/s12966-018-0685-1
    ISSN
    1479-5868
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/69185
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 The Author(s). Background: Data on time spent in physical activity, sedentary behavior and sleep during a day is compositional in nature, i.e. they add up to a constant value. Compositional data have fundamentally different properties from unconstrained data in real space, and require other analytical procedures, referred to as compositional data analysis (CoDA). Most physical activity and sedentary behavior studies, however, still apply analytical procedures adapted to data in real space, which can lead to misleading results. The present study describes a comparison of time spent sedentary and in physical activity between age groups and sexes, and investigates the extent to which results obtained by CoDA differ from those obtained using standard analytical procedures. Methods: Time spent sedentary, standing, and in physical activity (walking/running/stair climbing/cycling) during work and leisure was determined for 1-4 days among 677 blue-collar workers using accelerometry. Differences between sexes and age groups were tested using MANOVA, using both a standard and a CoDA approach based on isometric log-ratio transformed data. Results: When determining differences between sexes for different activities time at work, the effect size using standard analysis (?2= 0.045, p < 0.001) was 15% smaller than that obtained with CoDA (?2= 0.052, p < 0.001), although both approaches suggested a statistically significant difference. When determining corresponding differences between age groups, CoDA resulted in a 60% larger, and significant, effect size (?2= 0.012, p = 0.02) than that obtained with the standard approach (?2= 0.008, p = 0.07). During leisure, results based on standard (age; ?2= 0.007, p = 0.09; sex; ?2= 0.052, p < 0.001) and CoDA (age; ?2= 0.007, p = 0.09; sex; ?2= 0.051, p < 0.001) analyses were similar. Conclusion: Results and, hence, inferences concerning age and sex-based differences in time spent sedentary and in physical activity at work differed between CoDA and standard analysis. We encourage researchers to use CoDA in similar studies, to adequately account for the compositional nature of data on physical activity and sedentary behavior.

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