Among girls , we found a reduction of adiposity in intervention versus control schools , with a decrease in TST ( -@ mm ; @ % confidence interval -LSB- CI -RSB- -@ to -@ ) , body fat % ( -@ % ; @ % CI -@ to -@ ) , waist circumference ( -@ cm ; @ % CI -@ to -@ ) , and an increase in fat-free mass ( @ kg ; @ % CI @ to @ ) .