At 6 months , mean weight loss in the CM+CHW arm was -2.1 kg ( 95 % CI -2.8 to -1.3 ) or -2 % of baseline weight ( 95 % CI -1 % to -2 % ) compared with -1.6 kg ( 95 % CI -2.4 to -0.7 ; % weight change , -2 % , -1 % , and -3 % ) in CM and -0.9 kg ( 95 % CI -1.8 to 0.1 ; % weight change , -1 % , 0 % , and -2 % ) in UC .