Rabkin 1984.

Methods	Country: Canada. Study sites: not stated. Study period: not stated. Recruitment: via media (radio and newspaper, etc), all participants had enrolled with the promise of a "meaningful" cigarette smoking intervention programme. Sample size calculation: not mentioned.
Participants	Number of participants: 168 smokers (hypnosis 48; health education 41; behaviour modification 46; control 33). Inclusion criteria: smokers between age 20 and 65. Exclusion criteria: patients with serious medical problems. Overall demographics: average age: 40.4, average of 24.3 CPD.
Interventions	a) Hypnosis ‐ 1 x 30 minutes one‐to‐one basis hypnosis session (Spiegel's method and instructions for autohypnosis) plus suggested autohypnosis every hour or hour and a half over the next week and whenever necessary.. b) Behaviour modification ‐ 5 x evening meetings (45 to 90mins over a 3‐week period) on group discussion about smoking behaviours plus daily smoking behaviour records for participants to do. c) Health education ‐ 1 x health education session followed the format of cessation programmes emphasizing the biological effects of smoking and incorporated data on behavioural factors such as perception of risk and efficacy plus materials on how to quit (U.S. DHEW, 1979) to take home, plus participants were asked to write down their reasons to quit on paper to take home and mount in a conspicuous place, plus individual meetings in approximate 1 week later of review and counselling. d) Waiting list control ‐ delayed treatment group, received behaviour modification treatment 3 weeks after completion of the programmes in treatment groups. No follow‐up thereafter. Duration of intervention: 3 weeks. Duration of follow‐up: 6 months
Outcomes	Definition of smoking cessation: point prevalence abstinence at 6 month follow‐up. Adverse events: no information provided on whether or not AE data were collected and whether any AEs occurred.
Notes	Funding: supported in part by Manitoba Medical Services Foundation and Fellowship award from National Health and Welfare to the first author. Author declaration of interest: not reported. Additional notes: control group was not used in any comparison since no follow‐up at 6 months.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomized, method not stated
Allocation concealment (selection bias)	Unclear risk	No details given
Blinding of outcome assessment (detection bias) All outcomes	High risk	Blinding not possible due to nature of intervention. Mailed questionnaire with no validation at 6 months, i.e. abstinence was based on self‐report.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Dropouts: a) 10; b) 8; c) 10. Lost to follow‐up at 6 months: a) 9; b) 4; c) 6. All excluded from the original analysis. We included all participants in our recalculations following our protocol of intention to treat analyses with missing assumed smoking.
Selective reporting (reporting bias)	Low risk	All outcomes reported as described in the methods section