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Estimated NNT for preventing PONV (P6 acupoint stimulation versus sham)
| Control event rate | Nausea | 95% CI | Vomiting | 95% CI |
|---|---|---|---|---|
| 10% | 34 | 26 to 59 | 33 | 24 to 59 |
| 20% | 17 | 13 to 29 | 17 | 12 to 29 |
| 30% | 11 | 9 to 20 | 11 | 8 to 20 |
| 40% | 9 | 6 to 15 | 8 | 6 to 15 |
| 50% | 7 | 5 to 12 | 7 | 5 to 12 |
| 60% | 6 | 4 to 10 | 6 | 4 to 10 |
| 70% | 5 | 4 to 8 | 5 | 3 to 8 |
| 80% | 4 | 3 to 7 | 4 | 3 to 7 |
| 90% | 4 | 3 to 7 | 4 | 3 to 6 |
