Comparison 3. Antistaphylococcal cephalosporins C1 and C2 (1^st and 2^nd generation) vs broad spectrum penicillins plus betalactamase inhibitors P2+ ‐ subgrouped by generation of cephalosporin.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
3.1 Maternal sepsis	1	75	Risk Ratio (M‐H, Fixed, 95% CI)	2.37 [0.10, 56.41]
3.1.1 Cephalosporins C1 (1st generation) vs penicillins plus betalactamase inhibitors P2+	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	Not estimable
3.1.2 Cephalosporins C2 (2nd generation) vs penicillins plus betalactamase inhibitors P2+	1	75	Risk Ratio (M‐H, Fixed, 95% CI)	2.37 [0.10, 56.41]
3.2 Maternal endometritis	7	1161	Risk Ratio (M‐H, Fixed, 95% CI)	1.10 [0.76, 1.60]
3.2.1 Cephalosporins C1 (1st generation) vs penicillins plus betalactamase inhibitors P2+	2	268	Risk Ratio (M‐H, Fixed, 95% CI)	1.56 [0.59, 4.16]
3.2.2 Cephalosporins C2 (2nd generation) vs penicillins plus betalactamase inhibitors P2+	6	893	Risk Ratio (M‐H, Fixed, 95% CI)	1.02 [0.68, 1.53]