| Methods |
Setting: Quitline, Oregon, USA
Recruitment: Callers to quitline |
| Participants |
4500 smokers willing to make a quit attempt; 40% M, av. age 41, av. cigs/day 22 |
| Interventions |
Factorial design; 3 levels of counselling, ± offer of nicotine patch (5‐week supply, 80% accepted, option for 3 weeks more, 25 ‐ 28% requested)
1. Brief counselling (usual care), 15 mins + referral information and tailored S‐H
2. Moderate TC: 30 ‐ 40 mins MI, brief call to encourage use of community services, tailored S‐H
3. Intensive; as 2, plus offer of up to 4 further calls (Free & Clear) |
| Outcomes |
Abstinence > 30 days at 12 m
Validation: none |
| Notes |
First included as Hollis 2005, based on unpublished abstract. |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Random sequence generation (selection bias) |
Unclear risk |
Randomised, method not described |
| Allocation concealment (selection bias) |
Unclear risk |
No details given |
| Blinding of outcome assessment (detection bias)
All outcomes |
High risk |
Self‐reported outcomes from participants not blinded to treatment condition. Level of personal contact differed between arms |
| Incomplete outcome data (attrition bias)
All outcomes |
Low risk |
69% reached at 12 m. Losses assumed smoking in main analysis, sensitivity analyses reported |
