Table 2.

Association between pregestational BMI and patterns of postpartum weight change

Reference group: return to pregestational weight	PPWR				PPWG			PPWR + WG
Pregestational BMI*	n	RRR	95 % CI	P-value	RRR	95 % CI	P-value	RRR	95 % CI	P-value
Model 1†
Normal weight	205	Reference			Reference			Reference
Overweight	203	0·77	0·37, 1·61	0·491	2·53	1·33, 4·81	0·005	1·26	0·76, 2·09	0·370
Obese	92	0·44	0·14, 1·37	0·158	2·19	1·02, 4·71	0·045	1·04	0·54, 1·99	0·911
Model 2‡
Normal weight	205	Reference			Reference			Reference
Overweight	203	0·81	0·39, 1·70	0·583	2·49	1·30, 4·77	0·006	1·27	0·75, 2·13	0·373
Obese	92	0·42	0·13, 1·29	0·129	2·19	1·00, 4·79	0·049	1·03	0·53, 2·00	0·940

PPWR, postpartum weight retention; PPWG, postpartum weight gain; PPWR + WG, postpartum weight retention + weight gain; RRR, relative risk ratio.

Results from multinomial logistic regression models.

^*Pregestational BMI: normal weight (<25 kg/m²), overweight (≥25 to <30 kg/m²) and obese (≥30 kg/m²).

^†Model 1: adjusted for age.

^‡Model 2: adjusted for age, marital status (single/separated and married/cohabitating), education (basic: elementary and secondary school; middle: high school; college: at least college), parity (primiparous and multiparous) and socioeconomic status (high, middle and low).