| Methods | Y; B; Y; Y; N; N | |
| Participants | 44 adults; 23 female; hemiarthroplasty; >50 (mean 69); ASA1‐3; exc' allergy, various drugs, heart/liver disease, regional anaesthesia | |
| Interventions | Preoperative AND postoperative twice Either; PLACEBO thrice; or oral CLONIDINE 5 mcg/kg thrice | |
| Outcomes | Nausea; vomiting. Postop 0‐24 hours. | |
| Notes | Male/female incidences not reported. Side effect "clonidine sedative". 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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