%0 Journal Article %T Association between questionnaire- and accelerometer-assessed physical activity: the role of sociodemographic factors. %+ Department of Epidemiology and Public Health %+ MoveLab— Physical Activity and Exercise Research %+ MRC Centre of Epidemiology for Child Health, Institute of Child Health %+ Centre de recherche en épidémiologie et santé des populations (CESP) %+ Centre de Gérontologie %A Sabia, Séverine %A van Hees, Vincent, T %A Shipley, Martin, J %A Trenell, Michael, I %A Hagger-Johnson, Gareth %A Elbaz, Alexis %A Kivimaki, Mika %A Singh-Manoux, Archana %Z This research was supported by the US National Institutes ofHealth (grant R01AG013196 to A.S.-M., grant R01AG034454to A.S.-M. and M.K., and grant R01HL036310 to M.K.) andthe Medical Research Council (grant K013351 to M.K.). M.J.S. was partly supported by the British Heart Foundation. M.K.was supported by a professorial fellowship from the Economicand Social Research Council. G.H.-J. was supported by agrant from the Economic and Social Research Council. %< avec comité de lecture %@ 0002-9262 %J American Journal of Epidemiology %I Oxford University Press (OUP) %V 179 %N 6 %P 781-90 %8 2014-03-15 %D 2014 %R 10.1093/aje/kwt330 %M 24500862 %K elderly %K epidemiologic methods %K physical activity %K accelerometry %K cohort studies %K questionnaires %Z Life Sciences [q-bio]/Santé publique et épidémiologieJournal articles %X The correlation between objective and self-reported measures of physical activity varies between studies. We examined this association and whether it differed by demographic factors or socioeconomic status (SES). Data were from 3,975 Whitehall II (United Kingdom, 2012-2013) participants aged 60-83 years, who completed a physical activity questionnaire and wore an accelerometer on their wrist for 9 days. There was a moderate correlation between questionnaire- and accelerometer-assessed physical activity (Spearman's r = 0.33, 95% confidence interval: 0.30, 0.36). The correlations were higher in high-SES groups than in low-SES groups (P 's = 0.02), as defined by education (r = 0.38 vs. r = 0.30) or occupational position (r = 0.37 vs. r = 0.29), but did not differ by age, sex, or marital status. Of the self-reported physical activity, 68.3% came from mild activities, 25% from moderate activities, and only 6.7% from vigorous activities, but their correlations with accelerometer-assessed total physical activity were comparable (range of r 's, 0.21-0.25). Self-reported physical activity from more energetic activities was more strongly associated with accelerometer data (for sports, r = 0.22; for gardening, r = 0.16; for housework, r = 0.09). High-SES persons reported more energetic activities, producing stronger accelerometer associations in these groups. Future studies should identify the aspects of physical activity that are most critical for health; this involves better understanding of the instruments being used. %G English %2 https://inserm.hal.science/inserm-01147406/document %2 https://inserm.hal.science/inserm-01147406/file/Sabia_AJE_2014.pdf %L inserm-01147406 %U https://inserm.hal.science/inserm-01147406 %~ INSERM %~ UNIV-PSUD %~ APHP %~ SANTE_PUB_INSERM %~ CESP %~ UVSQ %~ UNIV-PARIS-SACLAY %~ UNIV-PSUD-SACLAY %~ GS-SANTE-PUBLIQUE