Antoniou 2005.

Methods	Randomized trial of electrostimulation Country: Greece Recruitment. no details
Participants	Smokers (no other details)
Interventions	Single application of an electrical probe to the ear, (duration not stated) giving a) electrical stimulus with current intensity between 12‐20 mAmp, or b) no current
Outcomes	Smoking cessation at 12 months, no details on how data were collected or verified
Notes	Abstract only. 390 smokers randomised, but group sizes at baseline not stated
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	randomized in a 2:1 manner
Allocation concealment (selection bias)	Unclear risk	no details
Blinding (performance bias and detection bias) All outcomes	Unclear risk	described as 'double‐blind' in the title, but stimulation was at a level that could be detected in the intervention group; blinding was not checked
Incomplete outcome data (attrition bias) All outcomes	High risk	390 smokers enrolled, 339 evaluated. No group size at baseline so dropouts cannot be accounted for by allocation group
Other bias	Unclear risk	no baseline details