Comparison 1. Mortality.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Neonatal mortality before 28 days	8	656	Risk Ratio (M‐H, Fixed, 95% CI)	0.49 [0.28, 0.85]
2 Mortality at 36 weeks	7	360	Risk Ratio (M‐H, Fixed, 95% CI)	0.82 [0.50, 1.35]
3 Mortality to hospital discharge	19	1035	Risk Ratio (M‐H, Fixed, 95% CI)	0.86 [0.66, 1.12]
4 Mortality at latest reported age	19	1035	Risk Ratio (M‐H, Fixed, 95% CI)	0.84 [0.66, 1.07]