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
1 Vaginal delivery not achieved in 24 hours	3	608	Risk Ratio (M‐H, Random, 95% CI)	0.97 [0.75, 1.25]
2 Uterine hyperstimulation with FHR changes	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
3 Caesarean section	5	862	Risk Ratio (M‐H, Random, 95% CI)	0.97 [0.71, 1.33]
4 Serious maternal morbidity or death	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
5 Oxytcocin augmentation	2	278	Risk Ratio (M‐H, Fixed, 95% CI)	0.94 [0.82, 1.08]
6 Uterine hyperstimulation without FHR changes	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
7 Uterine rupture	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
8 Epidural analgesia	3	608	Risk Ratio (M‐H, Fixed, 95% CI)	0.93 [0.83, 1.03]
9 Instrumental vaginal delivery	3	690	Risk Ratio (M‐H, Fixed, 95% CI)	0.86 [0.61, 1.20]
10 Meconium‐stained liquor	1	98	Risk Ratio (M‐H, Fixed, 95% CI)	0.40 [0.15, 1.04]
11 Apgar score < 7 at 5 minutes	3	608	Risk Ratio (M‐H, Fixed, 95% CI)	0.84 [0.25, 2.79]
12 Neonatal intensive care unit admission	2	391	Risk Ratio (M‐H, Fixed, 95% CI)	1.67 [0.71, 3.93]
13 Other maternal side‐effects: pain after insertion	1	74	Risk Ratio (M‐H, Fixed, 95% CI)	0.67 [0.20, 2.17]
14 Postpartum haemorrhage	2	291	Risk Ratio (M‐H, Fixed, 95% CI)	0.83 [0.27, 2.52]
15 Maternal fever during labour	3	584	Risk Ratio (M‐H, Random, 95% CI)	0.61 [0.16, 2.34]
16 Antibiotics during labour	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	0.97 [0.61, 1.56]
17 Chorioamnionitis	1	98	Risk Ratio (M‐H, Fixed, 95% CI)	1.56 [0.47, 5.20]
18 Endometritis	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	1.95 [0.18, 21.14]
19 Fetal distress	4	682	Risk Ratio (M‐H, Fixed, 95% CI)	0.98 [0.70, 1.36]
20 Umbilical artery pH < 7.10	1	217	Risk Ratio (M‐H, Fixed, 95% CI)	0.42 [0.11, 1.57]