Glasgow 1981.
Methods | Setting: community, USA Recruitment: media advertisements | |
Participants | 88 smokers (40 in self‐help conditions) | |
Interventions | Factorial trial of 3 different self‐help materials, with or without additional group support ∙ Danaher & Lichtenstein manual ∙ Pomerleau & Pomerleau manual ∙ I Quit Kit | |
Outcomes | Abstinence at 6 months Validation: CO < 15 ppm | |
Notes | 3 different self‐help conditions and no strong hypothesis about direction of treatment difference between the Danaher & Lichtenstein manual and the Pomerleau & Pomerleau manual, so not used in the meta‐analysis of different programmes No statistical differences between quit rates (also included in group therapy review) |
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Risk of bias | ||
Bias | Authors' judgement | Support for judgement |
Random sequence generation (selection bias) | Unclear risk | "Randomly assigned"; method not described |
Allocation concealment (selection bias) | Unclear risk | No details given |
Blinding (performance bias and detection bias) All outcomes | Low risk | Biochemical validation used; all groups received materials (differences in content only) |
Incomplete outcome data (attrition bias) All outcomes | Low risk | 3/88 lost to follow‐up; group not specified, so not included as smokers |