Comparison 16. Single balloon (Foley) versus double balloon (ATAD/Cook): all women.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
16.1 Vaginal delivery not achieved in 24 hours	3	608	Risk Ratio (M‐H, Random, 95% CI)	0.97 [0.75, 1.25]
16.2 Uterine hyperstimulation with FHR changes	1	0	Risk Ratio (M‐H, Fixed, 95% CI)	Not estimable
16.3 Caesarean section	5	862	Risk Ratio (M‐H, Random, 95% CI)	0.97 [0.71, 1.33]
16.4 Serious maternal morbidity or death	1	0	Risk Ratio (M‐H, Fixed, 95% CI)	Not estimable
16.5 Oxytcocin augmentation	2	278	Risk Ratio (M‐H, Fixed, 95% CI)	0.94 [0.82, 1.08]
16.6 Uterine hyperstimulation without FHR changes	1	0	Risk Ratio (M‐H, Fixed, 95% CI)	Not estimable
16.7 Uterine rupture	1	0	Risk Ratio (M‐H, Fixed, 95% CI)	Not estimable
16.8 Epidural analgesia	3	608	Risk Ratio (M‐H, Fixed, 95% CI)	0.93 [0.83, 1.03]
16.9 Instrumental vaginal delivery	3	690	Risk Ratio (M‐H, Fixed, 95% CI)	0.86 [0.61, 1.20]
16.10 Meconium‐stained liquor	1	98	Risk Ratio (M‐H, Fixed, 95% CI)	0.40 [0.15, 1.04]
16.11 Apgar score < 7 at 5 minutes	3	608	Risk Ratio (M‐H, Fixed, 95% CI)	0.84 [0.25, 2.79]
16.12 Neonatal intensive care unit admission	2	391	Risk Ratio (M‐H, Fixed, 95% CI)	1.67 [0.71, 3.93]
16.13 Other maternal side‐effects: pain after insertion	1	74	Risk Ratio (M‐H, Fixed, 95% CI)	0.67 [0.20, 2.17]
16.14 Postpartum haemorrhage	2	291	Risk Ratio (M‐H, Fixed, 95% CI)	0.83 [0.27, 2.52]
16.15 Maternal fever during labour	3	584	Risk Ratio (M‐H, Random, 95% CI)	0.61 [0.16, 2.34]
16.16 Antibiotics during labour	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	0.97 [0.61, 1.56]
16.17 Chorioamnionitis	1	98	Risk Ratio (M‐H, Fixed, 95% CI)	1.56 [0.47, 5.20]
16.18 Endometritis	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	1.95 [0.18, 21.14]
16.19 Fetal distress	4	682	Risk Ratio (M‐H, Fixed, 95% CI)	0.98 [0.70, 1.36]
16.20 Umbilical artery pH < 7.10	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	0.42 [0.11, 1.57]