THE EPIDEMIOLOGY OF LEISURE PHYSICAL-ACTIVITY IN AN ADOLESCENT POPULATION

A cohort of 1245 adolescents, 12-16 vr old and participating in a pros pective study of risk factors for injury, were surveyed annually to as sess past year leisure physical activity. This report describes the de velopment and reproducibility of the questionnaire and provides the de scriptive epidemiology of leisure physical activity in adolescents. Th e questionnaire was self-administered twice, a year apart. and had a 1 vr test-retest rank order correlation of 0.55. The past year estimate of leisure activity was also shown to be related to fitness (rho = -0 .37). which was defined as the time needed to complete a 1-mile run. M ales reported significantly more activity than females (P < 0.05) and whites reported more activity than nonwhites (P < 0.05). However, soci oeconomic status was not found to be a determinant of activity levels in either males or females. In females, a negative association between activity and age was found (P < 0.05): however, this association was not evident in males. In summary, an activity questionnaire has been d eveloped and was shown to be both reproducible and feasible. Therefore , it was used to examine habitual leisure physical activity patterns o f adolescents.