Comparison 3. Interventions for callers to quitlines ‐ subgroups by counseling intensity.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Cessation at longest follow‐up	14	32484	Risk Ratio (M‐H, Random, 95% CI)	1.37 [1.20, 1.57]
1.1 Two sessions or fewer	2	3867	Risk Ratio (M‐H, Random, 95% CI)	1.22 [1.02, 1.46]
1.2 Three to six sessions	11	22612	Risk Ratio (M‐H, Random, 95% CI)	1.38 [1.17, 1.63]
1.3 Seven sessions or more	4	6005	Risk Ratio (M‐H, Random, 95% CI)	1.49 [0.98, 2.25]