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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 2.1 Adequate pain relief as reported by the woman | 1 | Risk Ratio (M‐H, Fixed, 95% CI) | Subtotals only | |
| 2.2 Need for additional pain relief | 1 | Risk Ratio (M‐H, Fixed, 95% CI) | Subtotals only | |
| 2.3 Maternal adverse effects | 1 | Risk Ratio (M‐H, Fixed, 95% CI) | Subtotals only |
