Completer analyses suggested that the intervention tended to increase the percentages of women who reached prepregnancy weight ( n = 261 ; 45.3 % compared with 35.3 % ; P = 0.09 ) and significantly reduced the magnitude of mean SD postpartum weight retained ( 1.4 6.3 compared with 3.0 5.7 kg ; P = 0.046 ) at 12 mo. .