Omenn 1988.
Methods | Setting: single worksite (13,000 workers, 9 employers), USA Recruitment: worksite volunteers | |
Participants | 243 smokers with preference for a self‐help programme | |
Interventions | Only self‐help format conditions considered in this review ∙ Multiple‐component programme ∙ Relapse prevention programme ∙ Minimal treatment programme (American Cancer Society Quitter's Guide; 7‐day plan) | |
Outcomes | Abstinence at 12 months Validation: saliva cotinine ≤ 35 ng/mL | |
Notes | Comparison between self‐help materials; not in meta‐analysis No clinical or statistically significant differences between quit rates in the 3 groups |
|
Risk of bias | ||
Bias | Authors' judgement | Support for judgement |
Random sequence generation (selection bias) | Low risk | Quote: "nurses at aid stations using randomized assignment lists generated by research centre, within preference for format" |
Allocation concealment (selection bias) | Unclear risk | No details given |
Blinding (performance bias and detection bias) All outcomes | Low risk | Biochemical validation; interventions of similar intensities |
Incomplete outcome data (attrition bias) All outcomes | Low risk | At least 89% followed up in each arm; non‐respondents counted as smokers |