Comparison 10. Hypnosis preparation for labour versus hypnosis during labour (subgroup analysis).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Use of pharmacological pain relief/anaesthesia	8	2916	Risk Ratio (M‐H, Random, 95% CI)	0.73 [0.57, 0.94]
1.1 Hypnosis preparation for labour	7	2876	Risk Ratio (M‐H, Random, 95% CI)	0.74 [0.57, 0.97]
1.2 Hypnosis during labour	1	40	Risk Ratio (M‐H, Random, 95% CI)	0.67 [0.48, 0.94]
2 Spontaneous vaginal birth	2	1889	Risk Ratio (M‐H, Fixed, 95% CI)	1.00 [0.93, 1.08]
2.1 Hypnosis preparation for labour	2	1889	Risk Ratio (M‐H, Fixed, 95% CI)	1.00 [0.93, 1.08]
2.2 Hypnosis during labour	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]