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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Maternal pain relief poor (1 hour) | 1 | 138 | Risk Ratio (M-H, Fixed, 95% CI) | 1.09 [0.64, 1.86] |
| 2 Nausea and vomiting | 1 | 138 | Risk Ratio (M-H, Fixed, 95% CI) | 0.87 [0.40, 1.88] |
| 3 Maternal sleepiness | 1 | 138 | Risk Ratio (M-H, Fixed, 95% CI) | 0.67 [0.43, 1.04] |
| 4 Apgar ≤ 7 at 1 minute | 1 | 138 | Risk Ratio (M-H, Fixed, 95% CI) | 0.57 [0.39, 0.84] |
