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. 2019 May 2;2019(5):CD002850. doi: 10.1002/14651858.CD002850.pub4

Halpin 2006.

Methods Setting: Health Maintenance Organisation, USA
 Recruitment: Health plan members without current smoking cessation benefit, recruited for a study giving access to coverage
Participants 388 smokers; 34% M, 67% age 40+, 84% smoked < a pack/day
Interventions 1. Coverage for TC and pharmacotherapy (bupropion or NRT, USD 15 co‐pay)
 2. Coverage for TC; coverage for pharmacotherapy (bupropion or NRT, USD 15 co‐pay) only if enrolled in TC
 3. Coverage for pharmacotherapy only (control)
Outcomes Abstinence at 6 m (7‐day PP)
 Validation: none
Notes Not included in MA, results discussed separately, alongside trials for TC as adjunct to pharmacotherapy
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 Number lost to follow‐up not described, all participants included in analyses