In intent-to-treat analyses with baseline weight carried forward for missing data , IBI produced significantly larger mean ( SD ) weight losses than IDEA at 3 months ( 5.5 kg [ 4.4 ] vs. 1.3 kg [ 2.1 ] ) and 6 months ( 5.4 kg [ 5.6 ] vs. 1.3 kg [ 4.1 ] ) ( P < 0.001 ) .