Comparison 11. High hypnotisability versus low hypnotisability (subgroup analysis).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Use of pharmacological pain relief/anaesthesia	2	326	Risk Ratio (M‐H, Random, 95% CI)	0.86 [0.57, 1.30]
1.1 High hypnotisability	2	173	Risk Ratio (M‐H, Random, 95% CI)	0.43 [0.04, 4.56]
1.2 Low hypnotisability	2	153	Risk Ratio (M‐H, Random, 95% CI)	0.61 [0.13, 2.91]
2 Spontaneous vaginal birth	2	326	Risk Ratio (M‐H, Random, 95% CI)	1.09 [0.81, 1.46]
2.1 High hypnotisability	2	173	Risk Ratio (M‐H, Random, 95% CI)	1.10 [0.69, 1.75]
2.2 Low hypnotisability	2	153	Risk Ratio (M‐H, Random, 95% CI)	1.19 [0.59, 2.40]