Borland 2003.

Methods	Setting: Quitline, Australia Recruitment: smokers seeking materials or counselling
Participants	1578 smokers, 1050 in relevant arms, 54% female, modal age 30 to 49, average cpd 23
Interventions	∙ Standard self‐help quit‐pack based around SoC ∙ Additional tailored letters at baseline, at 3 months, and at 6 months based on mailed assessments ∙ Additional proactive telephone counselling (not included in this review) Some participants in all groups received brief reactive counselling before enrolment
Outcomes	Abstinence at 1 year (sustained for 9 months) Validation: none
Notes	2 vs 1, tailored self‐help vs standard self‐help
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	"Shuffling questionnaires"
Allocation concealment (selection bias)	Unclear risk	"no opportunity for interviewers to influence choice of condition", so bias judged unlikely
Blinding (performance bias and detection bias) All outcomes	Low risk	Self‐reported outcomes from participants not blinded to treatment condition, but with no personal contact and similar levels of intensity, considered at low risk for differential misreport
Incomplete outcome data (attrition bias) All outcomes	Low risk	Follow‐up 78.9% for 1; 76.9% for 2 Losses included in ITT analysis Excluding losses would marginally lower effect size