Mean minutes spent in MVPA (A) lunchtime (12:00-14:00), and (B) whole day (07:00-21:00) by categories of rainfall, at schools where: diamond = Children are kept indoors in wet weather, but indoor physical activities are allowed, square = Children kept indoors in wet weather, and indoor physical activities not allowed, cross = Children allowed outside in wet weather (no indoor physical activity options). Test for trend across rainfall categories; ns = not significant, * p < 0.05, ** p < 0.01. Error bars indicate 95% CI.
Harrison et al. International Journal of Behavioral Nutrition and Physical Activity 2011 8:47 doi:10.1186/1479-5868-8-47