| Number of | Percent with outcome | |||||
| At least moderate pain relief | Studies | Participants | Gabapentin, morphine, of their combination | Placebo | Risk ratio (95% CI) | NNT (95% CI) |
| Gabapentin alone | 1 | 96 | 61 | 25 | 2.5 (1.5 to 4.2) | not calculated |
| Morphine alone | 1 | 96 | 80 | 25 | 3.2 (1.9 to 5.2) | not calculated |
| Gabapentin plus morphine | 1 | 93 | 78 | 25 | 3.1 (1.9 to 5.1) | not calculated |
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