3. Sensitivity analysis.

Studya	Comparison groups	N	Postpartum initiation	Lactationb	Breast milkc	Infant growth
Levonorgestrel‐releasing intrauterine system (LNG‐IUS)
Shaamash 2005	LNG‐IUS (20 μg) CuT 380A IUD	320	6 to 8 weeks	NSd: full BF (Analysis 2.3)	‐‐‐	NSd: weight (Analysis 2.1) and length Analysis 2.2)
Stuart 2014	LNG‐IUS (20 μg) insertion times ≤ 48 hours 4 to 8 weeks	35	48 hours vs 4 to 8 weeks	NS: any BF (Analysis 3.1)	‐‐‐	‐‐‐
Etonogestrel‐releasing (ETG) implant: early versus standard insertion
Brito 2009	ETG implant, early insertion (1 to 2 days) No method for 6 weeks, then DMPA	40	24 to 48 hours vs 6 weeks	NS: full BF (Analysis 4.1)	‐‐‐	Weight: 6 weeks, ETG implant > no method (Analysis 4.2); 12 weeks, DMPA > ETG implant (Analysis 5.2)
Gurtcheff 2011	ETG implant, postpartum insertion Early (1 to 3 days) Standard (4 to 8 weeks)	65	1 to 3 days vs 4 to 8 weeks	NS: failure (Analysis 6.1); full BF (Analysis 6.4); any BF (Analysis 6.5)	NS: lactogenesis II (Analysis 6.2); creamatocrit (Analysis 6.3)	‐‐‐
Combined (COC) versus progestin‐only (POP) oral contraceptive
WHO 1984	COC levonorgestrel + EE POP norgestrel	171	6 weeks	‐‐‐	Volume: COC < POP (Analysis 7.1)	NSd: weight (Analysis 8.3)
Espey 2012	COC norethindrone + EE POP norethindrone	179	2 weeks	NS: BF (Analysis 8.3)	‐‐‐	NS: weight (Analysis 8.1) and length (Analysis 8.2)

^aIncludes studies with moderate‐quality evidence (Table 9) and sufficient outcome data (Table 10). Direction of significant differences shown (reported or analyzed); NS = not significantly different.
 ^bInitiation; failure; breastfeeding (BF) full, any, or discontinuation.
 ^cTime to lactogenesis II; milk volume or composition.
 ^dReported; insufficient data for analysis in this review.