American Journal of Epidemiology Advance Access published online on March 10, 2007
American Journal of Epidemiology, doi:10.1093/aje/kwk119
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PRACTICE OF EPIDEMIOLOGY |
Reproducibility and Validity of the Shanghai Men's Health Study Physical Activity Questionnaire
1 Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt University Medical Center and Vanderbilt-Ingram Cancer Center, Nashville, TN
2 Department of Epidemiology, Shanghai Cancer Institute, Shanghai, People's Republic of China
Correspondence to Dr. Xiao-Ou Shu, Center for Health Services Research, Vanderbilt University Medical Center, 1215 21st Avenue South, Nashville, TN 37232-8300 (e-mail: xiao-ou.shu{at}vanderbilt.edu).
Received for publication July 5, 2006. Accepted for publication October 31, 2006.
Reproducibility and validity of the physical activity questionnaire (PAQ) used in the Shanghai Men's Health Study (2003–2006, People's Republic of China) was evaluated in a random sample of 196 participants aged 40–74 years. Participants completed a PAQ at baseline and again 1 year later, 12 monthly 7-day physical activity recalls, and four quarterly 1-week physical activity logs. Reproducibility was evaluated by using the two PAQs and validity by comparing the PAQs with 1-year averages of the two criterion measures: 7-day physical activity recall and physical activity log. The PAQ had moderate to high reproducibility for measuring adult exercise participation (
= 0.60) and energy expenditure (rs = 0.68), nonexercise activities (correlation coefficients = 0.42–0.68), and total daily energy expenditure (rs = 0.68, quartiles = 0.47). Correlations between the PAQ and criterion measures of adult exercise were 0.45 (7-day physical activity recall) and 0.51 (physical activity log) for the first PAQ and 0.62 (7-day physical activity recall) and 0.71 (physical activity log) for the second PAQ. Correlations between PAQ nonexercise activities and the physical activity log and 7-day physical activity recall were 0.31–0.86. Correlations for total energy expenditure were high (0.62–0.77). Results indicate that the Shanghai Men's Health Study PAQ has reasonable reproducibility and validity for classifying men by their level of exercise and nonexercise activities in this cohort.
exercise; questionnaires; reproducibility of results; validation studies
Abbreviations: MET, metabolic equivalent task; PAQ, physical activity questionnaire; SMHS, Shanghai Men's Health Study