Table 3.

Weight retention at 6 months postpartum in relation to full and partial breast-feeding duration (n 49 675), Norwegian Mother and Child Cohort Study (MoBa)

	β (kg/month)	95 % CI	P value
Duration of breast-feeding up to 6 months postpartum†
All women‡
Full breast-feeding	−0·50	−0·53, −0·47	<0·001
Partial breast-feeding	−0·25	−0·28, −0·22	<0·001
Full breast-feeding × household income	−0·05	−0·10, 0·00	0·054
Stratified analyses
Low household income
Full breast-feeding	−0·56	−0·61, −0·51	<0·001
Partial breast-feeding	−0·27	−0·33, −0·22	<0·001
High household income
Full breast-feeding	−0·50	−0·53, −0·46	<0·001
Partial breast-feeding	−0·23	−0·27, −0·20	<0·001

†Results from multivariate regression models. Both full and partial breast-feeding in the same model; all models adjusted for pre-pregnant BMI, pregnancy weight gain, maternal age and parity.

‡Interactions between income and education (respectively, 1 for lower levels/0 for higher levels) and full and partial breast-feeding were all tested. The only significant interaction was for full breast-feeding and household income.