Direkvand‐Moghadam 2013.

Study characteristics
Methods	RCT
Participants	Women, ASA 1 or 2, undergoing elective CD under spinal allocated to one of 3 groups. N = 102
Interventions	Intervention 1: dopamine antagonist (Comparison 2) Metoclopramide ‐ 15 mg. N = 34 Intervention 2: acupuncture/acupressure (Comparison 8) P6 acupressure N = 34 Comparison: placebo (no intervention) N = 34
Outcomes	Incidence of nausea and vomiting intra‐op, then 30, 60, 90, 120, 240 and 360 min after surgery
Notes	Setting: Mustafa University Hospital of Ilam, West Iran. Dates: Septemebr 2011 to October 2012. Funding source: Ilam University of Medical Sciences. Declaration of interest: not reported.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote:"random number table"
Allocation concealment (selection bias)	Unclear risk	Allocation undertaken by midwife prior to anaesthesia
Blinding of participants and personnel (performance bias) All outcomes	High risk	Patient aware of which allocation group patient was in
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Quote:"researcher not aware of grouping of patients"
Incomplete outcome data (attrition bias) All outcomes	Low risk	No data missing
Selective reporting (reporting bias)	Unclear risk	Not described
Other bias	Low risk	Nil apparent