Wakefield 2004.

Methods	Setting: Radiation therapy, medical oncology & haematology departments of a single hospital, Australia Recruitment: cancer patients, not selected for interest in quitting, but number refused enrolment due to lack of interest
Participants	137 smokers; 38% F, av. age 52, av. cpd 21 Provider: Counsellor
Interventions	1. Motivational interviewing by single counsellor, unspecified number and duration of sessions, advice to use NRT if motivated and smoking >15 cpd. 2. Brief advice, SH materials
Outcomes	Abstinence at 6m, prolonged for 3m Validation: cotinine < 400 nmol/mmol or CO < 8 ppm if using NRT
Notes	Average of 11 contacts, 18 min duration, 209 mins total contact/patient. 81% of intervention and 42% of controls reported use of NRT by 6m
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	'randomized'
Allocation concealment (selection bias)	Unclear risk	no details given.
Incomplete outcome data (attrition bias) All outcomes	Low risk	32 (23%) lost to follow‐up, included as smokers. 17 deaths excluded from denominators