Smith 2004.

Methods	Setting: 10 communities, Canada Recruitment: volunteers intending to quit
Participants	632 smokers (423 in relevant arms); 61% female, average age 42 years, 61% had prior use of NRT
Interventions	Factorial design comparing 2 intensities of TC and 2 types of print materials ∙ Booklet (Canadian Cancer Society (CCS) ‐ One Step at a Time ‐ 44 pages) ∙ Pamphlet (CCS How to Quit Smoking ‐ single page) TC conditions collapsed; booklet‐only control group not used in the review
Outcomes	Abstinence at 12 months, sustained at 3 months' and 6 months' follow‐up Validation: none
Notes	No non‐self‐help control; comparison between materials Results not reported by group; "no significant interactions or main effects"
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomised; stratified by community; method not described
Allocation concealment (selection bias)	Low risk	Centralised sequential envelopes
Blinding (performance bias and detection bias) All outcomes	Low risk	Self‐reported outcomes from participants not blinded to treatment condition, but no difference in personal contact between intervention arms, so differential misreport judged unlikely
Incomplete outcome data (attrition bias) All outcomes	Low risk	"Collapsing across telephone counselling groups, significantly more participants receiving print only were available for follow‐up at 12 months (73%) than those receiving telephone counselling (62%). Those not available for follow‐up were considered smokers for the intention‐to‐treat analyses"