The intervention group decreased their BMI ( the intervention effect is the difference in change between the groups adjusted for the respective baseline values ( DELTA ) = -@ kg/m@ , @ % CI : -@ ; -@ , P < @ ) , total body mass ( DELTA = -@ kg , @ % CI : -@ ; -@ , P < @ ) , and fat mass ( DELTA = -@ kg , @ % CI : -@ ; -@ , P < @ ) compared to the control group after the intervention .