| Methods | Y; A; Y; N; Y; N | |
| Participants | 5199 adults, PONV risk > 0.40; six interventions; 4086 analysed; 3279 women; mean 47; various surgeries | |
| Interventions | Intraoperative 20 minutes after start. Either: DEXAMETHASONE 4mg i.v.; or DROPERIDOL 1.25mg i.v.; or NO TREATMENT. Intraoperative 20 minutes before end. Either; ONDANSETRON 4mg i.v.; or NO TREATMENT. | |
| Outcomes | Nausea; vomiting; nausea or vomiting. Postop 0‐2; 2‐24; 0‐24 hours. | |
| Notes | Male/female incidences reported. Side effects not reported. Retching categorized as vomiting. | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment (selection bias) | Low risk | A ‐ Adequate |
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