Comparison 5. Oestrogen versus placebo: all primiparae.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
2 Uterine hyperstimulation with FHR changes	1	25	Risk Ratio (M‐H, Fixed, 95% CI)	3.44 [0.18, 64.88]
3 Caesarean section	2	69	Risk Ratio (M‐H, Fixed, 95% CI)	0.22 [0.04, 1.32]
4 Serious neonatal morbidity or perinatal death	1	25	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
8 Uterine hyperstimulation without FHR changes	1	25	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
11 Instrumental vaginal delivery	1	25	Risk Ratio (M‐H, Fixed, 95% CI)	0.57 [0.27, 1.20]
16 Perinatal death	1	25	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]