In random effects models adjusted for confounders , the intervention group was less likely to use any alcohol ( odds ratio 0.50 ; 95 % confidence interval [ CI ] , 0.23-1 .09 ; P = 0.08 ) and consumed fewer drinks per day ( coefficient -0.11 ; 95 % CI -0.23 -0.01 ; P = 0.07 ) than , the usual care group in the postpartum period but these differences were non-significant .