622 (61%) study members watched television for an average of more than 2 h per weekday between ages 5 and 15 years. Population-attributable fractions calculated on unadjusted results indicate that 17% (95% CI 7–25) of overweight, 15% (–2 to 29) of poor cardiorespiratory fitness, 15% (0–27) of raised cholesterol, and 17% (7–26) of current smoking in 26-year-olds could be attributed to exceeding this limit