Physical inactivity is a risk factor for physical activity-related injuries in children (INTERN) (2011)

The purpose of this prospective cohort study was to describe the risk factors associated with injuries resulting from physical education (PE), leisure time physical activity and sports in 9-12-year-old children. Injuries occurring during either PE class, leisure time PA or sports, and caused the child to at least stop the current activity were recorded prospectively. Individual weekly exposure was estimated from baseline and follow-up questionnaires. Potential risk factors were gender, age, socioeconomic status, ethnicity, habitual level of PA, body mass index and a motor fitness. A multivariate Cox proportional hazard regression model was developed, accounting for clustering within schools.