Butkovic 2005.

Methods	Parallel‐group randomized trial, conducted in Croatia. Study dates not reported.
Participants	120 children (5 ‐ 14 years) undergoing hernia repair, circumcision, or orchidopexy. Exclusion: children predisposed to nausea and vomiting secondary to gastroesophageal reflux, motion sickness, and inner ear or central nervious system disorders.
Interventions	Group 1: laser acupuncture on P6 acupoint bilaterally for 1 min, 15 min before induction of anaesthesia and IV infusion of saline (n = 40). Group 2: metoclopramide 0.15 mg/kg IV and sham laser on P6 acupoint bilaterally for 1 min, 15 min before induction of anaesthesia (n = 40). Group 3: sham laser stimulation on P6 acupoint bilaterally for 1 min, 15 min before induction of anaesthesia and saline infusion (n = 40).
Outcomes	Vomiting (0 ‐ 2 h), risk of rescue antiemetic drug.
Notes	Rescue antiemetic was ondansetron 0.1 mg/kg IV if vomiting was severe. No details about funding source or any declarations of interest among authors.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information.
Allocation concealment (selection bias)	Unclear risk	Insufficient information.
Blinding of patients (performance bias) All outcomes	Low risk	Authors took adequate steps to make intervention appear similar.
Blinding of healthcare providers (performance bias) All outcomes	Low risk	"Researchers were double‐blinded" but no specific details about how blinding was achieved. Comment: probably done.
Blinding of outcome assessor (detection bias) All outcomes	Low risk	"Researchers were double‐blinded" but no specific details about how blinding was achieved. Comment: probably done.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No missing data reported for the 120 children analysed.
Selective reporting (reporting bias)	High risk	Description of side effects not included. Nausea not reported because it may be difficult to assess in children.
Other bias	Low risk	Baseline characteristics were comparable. "Demographic data showed no significant difference among groups".