Reliability of a physical activity questionnaire in middle-aged men

Although some items from a questionnaire used to assess occupational and le isure activity in a cohort of male factory workers have reasonable validity , their reliability is unknown. In this study the reliability of this quest ionnaire was assessed in 54 middle-aged male factory employees by test-rete st administration over a 4-6 week period. Kappa statistics for test-retest agreement for individual items on the questionnaire ranged between 0.24 and 0.66. These items that demonstrated reasonable reliability and validity wi ll subsequently be related to a range of disease endpoints in a prospective cohort study.