Comparison 4. Tailored self‐help vs non‐tailored self‐help.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Long‐term abstinence	19		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
1.1 Tailored vs standard or stage‐matched materials (contact matched)	10	11024	Risk Ratio (M‐H, Random, 95% CI)	1.07 [0.89, 1.30]
1.2 Tailored multiple mailings vs standard or stage‐matched single mailing	9	14166	Risk Ratio (M‐H, Random, 95% CI)	1.42 [1.20, 1.68]