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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Overall pain relief | 1 | odds ratio (Fixed, 95% CI) | 3.27 [0.61, 17.69] | |
| 2 Unintended effects of treatment | 1 | odds ratio (Fixed, 95% CI) | 0.46 [0.09, 2.47] | |
| 3 Requirements for additional medication | 1 | odds ratio (Fixed, 95% CI) | 0.12 [0.01, 1.29] |
