Free spss 16.010/13/2023 Boys were found to take part in about twice as much vigorous and hard activity as girls (mean (95% confidence interval) 64.3 (53.2 to 75.4) min in boys compared with 37 (33.1 to 40.9) min in girls p<0.001). Body composition and fitness data were obtained for 224 children and activity data for 152 children. Twelve schools agreed to participate in the study.
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