Comparison 6. Other enhancements/adjuncts to self‐help materials.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Long‐term abstinence	11		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
1.1 Additional written materials	4	4741	Risk Ratio (M‐H, Random, 95% CI)	1.20 [0.91, 1.58]
1.2 Additional video	2	424	Risk Ratio (M‐H, Random, 95% CI)	0.73 [0.35, 1.51]
1.3 Targeted materials vs standard materials	5	3101	Risk Ratio (M‐H, Random, 95% CI)	1.12 [0.90, 1.38]