Okuyemi 2013.

Methods	Study design: Randomized controlled trial Setting: 8 emergency homeless shelters and transitional housing units in Minneapolis/St Paul, Minnesota, USA Recruitment: through health fairs, staff informational sessions, fliers at homeless shelters and word of mouth
Participants	430 homeless adult smokers; 75% men; av. age 44; cpd 19; motivated to quit
Interventions	Therapists: Counsellors 1. Control: Brief advice 10 ‐ 15 mins 2. Intervention: 6 x 15 ‐ 20‐min MI counselling sessions, baseline and wks 1, 2, 4, 6 and 8 Pharmacotherapy: All participants in both groups received a 2‐wk supply of 21 mg nicotine patches, every 2 wks over the 8‐wk treatment period All participants received a health educational resource called The Power to Quit: A Quit Smoking Guide, developed by the project investigators
Outcomes	Abstinence at 6 m (7‐day PP) Validation: CO ≤ 10 ppm. Salivary cotinine ≤ 20 ng/ml if CO > 10 ppm for those who self‐reported abstinence
Notes	New for 2016 update
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomization schedule prepared by study statistician, but no detail given on how
Allocation concealment (selection bias)	Unclear risk	No details given
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Biochemical validation of abstinence
Incomplete outcome data (attrition bias) All outcomes	Low risk	Loss to follow‐up, 22% (48/216) I 29% (63/214) C, all treated as smokers in MA