Validity of a Physical Activity Questionnaire in Shanghai

National Cancer Institute, Division of Cancer Epidemiology and Genetics, Bethesda, MD, USA.
Medicine and science in sports and exercise (Impact Factor: 3.98). 12/2010; 42(12):2222-30. DOI: 10.1249/MSS.0b013e3181e1fcd5
Source: PubMed


In large epidemiologic studies, physical activity (PA) is often assessed using PA questionnaires (PAQ). Because available PAQ may not capture the full range of PA in which urban Chinese adults engage, a PAQ was developed for this purpose. We examined the validity of this PAQ and the 1-yr stability of PA in 545 urban Shanghai adults.
The PAQ was interview-administered twice, approximately 1 yr apart, and participants also wore an accelerometer and completed a PA-log for seven consecutive days every 3 months during the same year. The intraclass correlation coefficient (ICC) was used to evaluate the stability of PA across questionnaire administrations, and Spearman correlation coefficients (ρ) and mean differences and 95% limits of agreement were used to examine the validity of the questionnaire compared against accelerometry and the PA-log.
When measured by accelerometry, estimates of time spent in moderate-to-vigorous PA were lower and estimates of time spent sedentary were higher than when self-reported on the PAQ (P < 0.001). Total PA (ICC = 0.65) and PA domains (ICC = 0.45-0.85) showed moderate to high stability across PAQ administrations. Total PA (ρ = 0.30), moderate-to-vigorous activity (ρ = 0.17), light activity (ρ = 0.36), and sedentary behavior (ρ = 0.16) assessed by PAQ and by accelerometry were significantly and positively correlated, and correlations of the PAQ with the PA-log (ρ = 0.36-0.85) were stronger than those observed with accelerometry.
The PAQ significantly overestimated time spent in moderate-to-vigorous activity and underestimated time spent in light activity and sedentary behavior compared with accelerometry, but it performed well at ranking participants according to PA level.

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    • "The ability of the SP2PAQ and the IPAQ, which assesses similar domains of physical activity, to assess physical activity in Asian populations has not been evaluated. This is important because the validity of other physical activity questionnaires used in Asian population such as the questionnaire in the Shanghai physical activity study had limited validity for moderate-to-vigorous intensity (spearman correlation of 0.17)[15]. "
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    • "The studies addressed above used objective measurements with accelerometers. The subjective amount of physical activity would probably be higher, because (older) people often indicate higher levels of physical activity than indicated by objective measurements (Troiano et al. , 2008 ; Banda et al. , 2010 ; Peters et al. , 2010b ). In addition, the prevalence of sedentary people assessed by questionnaires varies from 14 % to 41 % (Carlson et al. , 2009 ), which emphasizes the limitations of self-reported physical activity habits (Clark et al. , 2009 ; Harris et al. , 2009 ). "
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