Table 3.

Subgroup analyses of postpartum weight retention stratified by postpartum duration and US Institute of Medicine (IOM) guidelines

		Below v. within			Above v. within
Variable	n *	Net change	95 % CI	I 2 (%)	Net change	95 % CI	I 2 (%)
Postpartum duration
1–3 months	5	−2·75	−3·48, −2·03	71·5	4·33	3·12, 5·53	90·8
3–6 months	3	−2·00	−2·17, −1·83	0·0	3·20	3·03, 3·37	0·0
6–12 months	4	−1·95	−2·21, −1·68	74·4	2·11	1·61, 2·61	60·4
12–36 months	3	−1·82	−2·59, −1·05	84·5	2·33	0·44, 4·23	96·0
≥15 years	2	−1·42	−3·08, 0·24	69·1	4·65	2·8, 6·5	70·1
IOM guidelines
IOM 1990	12	−2·02	−2·65, −1·38	75·3	3·55	2·34, 4·76	90·6
IOM 2009	5	−2·33	−2·65, −2·01	88·9	3·08	2·61, 3·56	95·7

^*Number of comparisons.