Noroozinia 2013.

Study characteristics
Methods	RCT
Participants	152 women ASA 1 or 2 undergoing elective CD under spinal anaesthesia
Interventions	Intervention: acupuncture/acupressure (Comparison 8) P6 acupressure sea bands placed bilaterally 30 minutes before surgery. N = 76 Comparison: placebo Placebo wrist bands. N = 76
Outcomes	Intra‐op and post‐op (in first, second and third 2‐hour periods) nausea and vomiting
Notes	Setting: Imam Khomeini Training Hospital, Urmia, Iran. Dates: 2010 Funding source: not reported. Declaration of interest: not reported. VAS scoring of nausea performed at unspecified times (esp intra‐op, no info). Post‐op incidence of vomiting performed in PACU,quote: "0‐2 hrs", "2‐4 hrs" and "4‐6 hrs". For comparisons in this review the post‐op N& V incidence was averaged over the 4 time epochs. Revman does not permit decimal entries (i.e. 1.25, 1.5), so 1.25 rounded down to 1; 1.5 rounded up to 2
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Unspecifed:quote: "randomly allocated"
Allocation concealment (selection bias)	Unclear risk	Elastic band on wrist used in all women but those with acupressure point may have known they had it
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Blinding difficult for pressure sensitive area
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Quote: "Chart assessment", otherwise unspecified
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No dropouts?
Selective reporting (reporting bias)	Unclear risk	Unspecified
Other bias	Unclear risk	No sample size calculation, no VAS results presented