Comparison 9. Subgroup by number of sessions, high take‐up only.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Cessation at longest follow‐up	29		Risk Ratio (M‐H, Fixed, 95% CI)	Subtotals only
1.1 1‐3 sessions	5	2284	Risk Ratio (M‐H, Fixed, 95% CI)	1.74 [1.37, 2.22]
1.2 4‐8 sessions	15	5669	Risk Ratio (M‐H, Fixed, 95% CI)	2.01 [1.72, 2.33]
1.3 Over 8 sessions	9	1792	Risk Ratio (M‐H, Fixed, 95% CI)	2.33 [1.76, 3.09]