Levin 2019.

Study characteristics
Methods	RCT
Participants	Inclusion criteria: Women having elective CS under regional anaesthesia N = 180 women randomised, nine were excluded after randomisation but we only used data from 2 groups so we analysed data from 120 women Exclusion criteria:
Interventions	Intervention 1: acupressure P6 Transcutaneous P6 acupoint stimulation N = 60 Intervention 2: drug combination ‐ excluded from the review Metoclopramide + ondansetron N = 60 Comparator: no treatment No therapy N = 60
Outcomes	Primary outcome: nausea and vomiting
Notes	Setting: Rutgers‐Robert Wood Johnson Medical School, New Jersey, USA Dates: July 2015 to March 2016. Funding source: authors state no funding. Declaration of interest: authors state no conflict.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer‐generated randomisation sequence
Allocation concealment (selection bias)	Unclear risk	No information given
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No described blinding at all
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No described blinding at all
Incomplete outcome data (attrition bias) All outcomes	Low risk	No loss to follow‐up
Selective reporting (reporting bias)	Unclear risk	Authors appear to report the outcomes intended, but we did not assess the trial protocol
Other bias	Unclear risk	Very limited detail in abstract/e‐poster, more detail in full paper