Ho 2006.

Study characteristics
Methods	RCT.
Participants	110 women scheduled for elective CS under spinal anaesthesia, ASA 1‐2, between 23 and 40 years, without carpal tunnel syndrome or nausea and vomiting in the previous 24 hours.
Interventions	Intervention: acupuncture/acupressure (K) P6 acupressure sea bands placed bilaterally 30 minutes before surgery. N = 55. Comparison: placebo Placebo wrist bands. N = 55.
Outcomes	Nausea and vomiting ‐ 1. spinal ‐ skin incision, 2. incision to delivery, 3. delivery to skin closure, 4 skin closure to PACU.
Notes	Setting: Taipei Veterans General Hospital and Mackay Memorial Hospital, Taipei, Taiwan. Dates: not reported. Funding source: not described. Declaration of interest: not described.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomised using quote: "envelope system".
Allocation concealment (selection bias)	Unclear risk	Type of envelope unclear.
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Quote: "Patients, anesthesiologists, obstetricians, and nurses were all blinded to treatment group". No further information provided.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Quote: "Patients, anesthesiologists, obstetricians, and nurses were all blinded to treatment group". No further information provided
Incomplete outcome data (attrition bias) All outcomes	Low risk	No loss to follow‐up.
Selective reporting (reporting bias)	Unclear risk	We did not assess the trial protocol.
Other bias	Low risk	No baseline imbalance.