El‐Deeb 2011a.

Study characteristics
Methods	Individual RCT
Participants	Inclusion criteria: Women having elective CS under spinal anaesthesia N = 450 women randomised Exclusion criteria:
Interventions	Intervention 1: 5‐HT3 antagonist (Comparison 1) Ondansetron 4 mg (2 mL) 30 min pre‐op + sham electrical stimulation on false‐P6 point N = 150 women randomised Intervention 2: acupressure (Comparison 8) Acupressure P6, electric stimulation for 30 minutes prior to spinal and saline IV N = 150 women randomised Placebo Control sham P6 electrical stimulation plus IV saline N = 150 women randomised
Outcomes	Nausea and vomiting per 10 minutes intraoperative. Nausea and vomiting at 2, 4, 6, 12, 24 hours postoperative 4 mg ondansetron as rescue Adverse effects Women's satisfaction
Notes	Setting: Mansoura, Egypt. Dates: not reported. Funding source: not reported. Declaration of interest: not reported.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote:"randomly allocated"
Allocation concealment (selection bias)	Unclear risk	Unspecified
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Unspecified. Sham needling was performed but no details on blinding
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Evaluation postoperatively by an independent anaesthetist who was blinded to group assignment.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Unspecified
Selective reporting (reporting bias)	Unclear risk	Unspecified
Other bias	Low risk	Nil apparent