Table 8. The GRADE evidence quality for each outcome.
| Outcomes | Number of studies | Quality assessment | Quality | ||||
|---|---|---|---|---|---|---|---|
| Risk of bias | Inconsistency | Indirectness | Imprecision | Publication bias | |||
| PONV | 10 | serious | not serious | not serious | not serious | not serious | ⨁⨁⨁◯ |
| Moderate | |||||||
| PON | 13 | serious | not serious | not serious | not serious | not serious | ⨁⨁⨁◯ |
| Moderate | |||||||
| POV | 9 | serious | not serious | not serious | not serious | not serious | ⨁⨁⨁◯ |
| Moderate | |||||||
| Use of rescue antiemetics | 17 | serious | not serious | not serious | not serious | not serious | ⨁⨁⨁◯ |
| Moderate | |||||||
| Complete response | 3 | serious | not serious | not serious | serious | not serious | ⨁⨁◯◯ |
| Low | |||||||
PON; postoperative nausea, POV; postoperative vomiting, PONV; postoperative nausea and vomiting