Direkvand‐Moghadam 2013.

Methods	Parallel 3‐arm randomized trial, conducted in Iran. Study conducted from September 2011 to October 2012.
Participants	102 healthy women, aged 18 ‐ 35 years, at first to fourth pregnancy, with normal foetal heart rates, undergoing Caesaren delivery with spinal anaesthesia between 29 September 2011 to 23 October 2012 at University Hospital of Ilam, West of Iran. Exclusion: Acute or chronic diseases associated with nausea and vomiting, carpal tunnel syndrome, preoperative opioids, weights < 50 kg or > 100 kg.
Interventions	Group 1: No P6 treatment group (n = 34) Group 2: Metoclopramide IV before spinal anaesthesia induction (n = 34) Group 3: P6 acupressure wristbands applied to both wrists 15 min before spinal anaesthesia induction and removed 6 hours after surgery (n = 34)
Outcomes	Nausea (0 ‐ 6 h), vomiting (0 ‐ 6 h), risk of rescue antiemetic drugs (0 ‐ 6 h).
Notes	All treatment groups were used in the analysis. Details of exact type of rescue antiemetic were not given. Power calculation done. Funding from Ilam University of Medical Sciences. No financial or other competing interests declared by authors.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	"Patients were randomly assigned to one of the three groups by a trained midwife, with 34 cases in each group, at the obstetrical triage unit, by using a random number chart".
Allocation concealment (selection bias)	Unclear risk	Insufficient information.
Blinding of patients (performance bias) All outcomes	Unclear risk	Insufficent information.
Blinding of healthcare providers (performance bias) All outcomes	Low risk	"The researcher was not aware of grouping of participants".
Blinding of outcome assessor (detection bias) All outcomes	Low risk	"The data collection was carried out by a trained midwife who was not also aware of each medication and who had no idea about the plan of the study."
Incomplete outcome data (attrition bias) All outcomes	Low risk	"None of the 102 enrolled parturients were withdrawn for any reason".
Selective reporting (reporting bias)	High risk	Description of side‐effects of acupressure or metoclopramide were not reported.
Other bias	Low risk	Baseline characteristics (age, weight, height, gestational age, duration of surgery" were comparable.