Abstract
Background: The purpose of this study was to assess the psychometric properties of a self-reported physical activity (PA) questionnaire based on data from the pilot phase of the AZAR Cohort Study. Methods: In this cross-sectional study, all 35-70 years old people living in Khameneh, a city in East Azarbaijan, Iran were invited to take part in the pilot phase of the AZAR Cohort Study. A total of 952 people completed the self-reported PA questionnaire and the International Physical Activity Questionnaire (IPAQ). Construct validity was evaluated by exploratory and confirmatory factor analyses (EFA and CFA). Spearman’s correlation coefficient between the scores of the two instruments was used to examine the concurrent validity. Reliability was measured using intraclass correlation coefficient (ICC) and Cronbach’s alpha coefficient. Results: In EFA applying principal component analysis with varimax rotation, four factors were identified including recreational leisure time (variance = 52.73%), sedentary leisure time (variance = 38.68%), household/gardening work (variance = 38.66%), and occupation work (variance = 12.67%). The extracted factors were also supported by the CFA (CFI = 0.98, GFI =0.936, RMSEA=0.057). The results indicated moderate concurrent validity (ρ = 0.62, P < 0.001). ICC and Cronbach’s alpha were 0.59 and 0.7, respectively. Conclusion: These results showed acceptable and moderate psychometric properties for the self-reported PA questionnaire to assess PA in this population-based study.
Highlights
The link between physical activity (PA) and health status has been evaluated in various epidemiological studies
The body mass index (BMI) value for 42.7% of the participants was in the range of 25-30
The present study sought to determine whether the selected self-reported PA questionnaire was a valid scale to assess PA patterns among the adults elected for the AZAR Cohort Study
Summary
The link between physical activity (PA) and health status has been evaluated in various epidemiological studies. Self-reported PA questionnaires are usually chosen as the most feasible methods to assess PA. As such questionnaires are inexpensive, brief, and have general acceptance, they can be applied to measure the frequency, duration, and intensity of PA.[10,11] The AZAR Cohort Study, initiated in 2014, is a population-based follow-up study conducted in East Azerbaijan province, Iran. The purpose of this study was to assess the psychometric properties of a selfreported physical activity (PA) questionnaire based on data from the pilot phase of the AZAR Cohort Study. Conclusion: These results showed acceptable and moderate psychometric properties for the self-reported PA questionnaire to assess PA in this population-based study
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