| Methods | Y; A; Y; Y; N; N | |
| Participants | 120 adults; 72 women; lap' chole'; ASA1,2; exc' PONV/motion sickness, disease, antiemetic | |
| Interventions | Induction Either: PLACEBO; or DEXAMETHASONE 5mg iv; or TROPISETRON 2mg | |
| Outcomes | All outcomes. Postop 0‐24 hours. | |
| Notes | Male/female incidences not reported. No side effects. Retching categorized as vomiting. | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment (selection bias) | Unclear risk | B ‐ Unclear |
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