| Methods | N; A; Y; N; N; N | |
| Participants | 34 adults; 11 women; maxillofacial; 19‐68 (mean 40); exc' men>120kg, women>100kg, pregnant/breastfeeding | |
| Interventions | Preoperative Either: PLACEBO; or ONDANSETRON 4mg i.v. | |
| Outcomes | Nausea; vomiting; rescue antiemetic. Postop 0‐1; 0‐4; 0‐24 hours. | |
| Notes | Male/female incidences not reported. Unclear how retching categorized or if vomiters nauseated or categorized once or twice. | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment (selection bias) | Unclear risk | B ‐ Unclear |
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