The intervention group increased in cardiorespiratory fitness ( 5.4 th percentile ; 95 % confidence interval [ CI ] , 1.8 to 8.9 ) and decreased in % FM ( -0.7 % ; 95 % CI , -1.1 to -0.4 ) and % CFM ( -1.3 % ; 95 % CI , -1.9 to -0.7 ) .