Ahn 2017.

Study characteristics
Methods	Quasi‐randomised controlled study, Korea
Participants	52 women submitted to elective CS, ASA I–II, haemoglobin levels of ≥10 g/dL, stable vital signs, singleton pregnancy without obstetric complications, the ability to communicate, and agreeing to use IV‐PCA after the caesarean delivery under spinal anaesthesia (group acupressure n: 26 and control group n: 26). One acupressure participant dropped out of the study because she could not keep the Seoambong on her skin and one control participant was excluded after being transferred to the intensive care unit.
Interventions	Intervention: Korean hand acupressure discs were applied for 24 hours onto 12 acupressure points (K‐9, F‐4 for nausea and vomiting; M‐3, M‐4, L‐4, H‐2, H‐3, H‐7 for abdominal pain; and I‐38, J‐2 for back pain). Control: not described
Outcomes	Nausea and vomiting incidences and pain scores were analysed.
Notes	Funding sources: did not receive any specific grant. Setting: Korean women’s hospital, Korea. Conflicts of interest: none declared. Dates of trial: not mentioned, published in 2017.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Quasi‐experimental design, randomly assigned. No detail provided.
Allocation concealment (selection bias)	Unclear risk	Not described.
Blinding of participants and personnel (performance bias) All outcomes	High risk	It was not possible to blind participants.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not described.
Incomplete outcome data (attrition bias) All outcomes	Low risk	There were few and balanced losses between groups (one lost in each group of 25 participants).
Selective reporting (reporting bias)	Low risk	All prespecified outcomes were reported.
Other bias	High risk	The trial authors did not describe the intervention details of the control group..