Gordon 2010b

Methods	Country: USA Recruitment: Smokers attending federally funded public health dental clinics in Mississippi, New York & Oregon Cluster randomized controlled trial
Participants	2549 adult smokers attending public dental clinics for non‐emergency visits
Interventions	1. Intervention ‐ Brief 'tailored' tobacco advice, assistance, & NRT 2. Usual Care ‐ Tobacco cessation methods as standard practice
Outcomes	Prolonged abstinence at 7.5m
Notes	Did not use small participant group of ST only (2.4%) and ST/smoked tobacco (1%) users in analysis. ICC for prolonged abstinence at 7.5m: 0.009.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Clinics were stratified by size and patient ethnicity, and randomized to one of two study conditions. Probably done through investigating institution.
Allocation concealment (selection bias)	Low risk	Centrally through Oregon Research Institute by clinic assignment
Incomplete outcome data (attrition bias) All outcomes	Low risk	Usual care response 73.9%, Intervention 69.3%; relatively equivalent attrition. Women more likely to respond than men; respondents were older, smoked longer, and more educated; impact of responder profile for significant bias likely low.