As shown in Figure 3, intent-to-treat analyses also showed
that the intervention increased percentages of NW and OW/OB
women who achieved their preconception weights or below at
6 mo postpartum (OR: 2.1; 95% CI: 1.3, 3.5; P = 0.005).
Overall, 30.7% (54 of 176 subjects) of the intervention group but
only 18.7% (34 of 182 subjects) of the standard care group were
at their preconception weights or below by 6 mo postpartum.
There was no significant weight · treatment group interaction
(P = 0.71). Similar effects for treatment (P = 0.004) were observed
in the analysis of completers that was adjusted for breastfeeding
at 6 mo postpartum; breastfeeding was also significantly related
to a higher odds of women achieving their 6-mo preconception
weights or below (OR: 2.4; 95% CI: 1.4, 4.2; P = 0.002); 40.5%
(53 of 131 subjects) of breastfeeders compared with 22.3% (35
of 157 subjects) of exclusive formula feeders achieved their
preconception weights or below at 6 mo postpartum. Breastfeeding
was not significantly related to the weight category or
treatment group. Repeated-measures analyses showed no significant
effects of treatment group on continuous measures of
weight changes during pregnancy and the postpartum period.