Yang 1993.

Methods	Parallel‐group randomized trial, conducted in Taiwan. Study dates not reported.
Participants	120 women undergoing gynaecological laparoscopy.
Interventions	Group 1: acupuncture group included participants given an injection of 0.2 mL 50% glucose in water into P6 acupoint before extubation (n = 40). Group 2: antiemetic group was droperidol 20 ug/kg IV on induction of anaesthesia (n = 40). Group 3: no treatment (n = 40).
Outcomes	Vomiting (0 ‐ 3 h), side effects of acupuncture.
Notes	Reference group received no treatment and was not included in data analysis. Pain at acupoint site noted. No details about funding source or any declarations of interest among authors.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information.
Allocation concealment (selection bias)	Unclear risk	Insufficient information.
Blinding of patients (performance bias) All outcomes	Unclear risk	Insufficient information.
Blinding of healthcare providers (performance bias) All outcomes	Unclear risk	Insufficient information.
Blinding of outcome assessor (detection bias) All outcomes	Unclear risk	Insufficient information.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No missing data recorded for 120 participants analysed.
Selective reporting (reporting bias)	High risk	Nausea was not reported.
Other bias	Low risk	Baseline characteristics were comparable. "There was no statistically significant differences in age, weight, duration of anesthesia or amount of fluid given among the three groups of patients".