Table 5.

Weight retention at 36 months postpartum in relation to breast-feeding duration (n 17 343), Norwegian Mother and Child Cohort Study (MoBa)

	β	95 % CI	P value
Duration of breast-feeding†
All women‡
Full breast-feeding up to 6 months (kg/month)	−0·14	−0·23, −0·04	0·006
Partial breast-feeding up to 6 months (kg/month)	−0·08	−0·17, 0·01	0·095
Partial breast-feeding for 6–11 months, yes/no (kg)	0·12	−0·17, 0·41	0·42
Partial breast-feeding for 12–18 months, yes/no (kg)	0·06	−0·12, 0·24	0·50
Full breast-feeding × household income	−0·11	−0·21, 0·00	0·054
Stratified analyses
Full breast-feeding up to 6 months (kg/month)
Low income	−0·31	−0·47, −0·14	<0·001
High income	−0·10	−0·21, 0·003	<0·056

†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.