Comparison 4. Sub‐group: treatment intensity ‐ Total exposure.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Patient asked to set a quit date	8	4332	Odds Ratio (M‐H, Random, 95% CI)	4.98 [1.79, 13.88]
1.1 Duration 40 minutes to 2 hours	5	2979	Odds Ratio (M‐H, Random, 95% CI)	5.63 [0.71, 44.43]
1.2 Duration >2 to 4 hours	2	1102	Odds Ratio (M‐H, Random, 95% CI)	4.70 [3.08, 7.16]
1.3 Duration >4 hours	1	251	Odds Ratio (M‐H, Random, 95% CI)	3.76 [0.65, 21.65]
2 Patient asked to make a follow‐up appointment	6		Odds Ratio (M‐H, Random, 95% CI)	Totals not selected
2.1 Duration 40 minutes to 2 hours	4		Odds Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]
2.2 Duration >2 to 4 hours	2		Odds Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]
3 Number of smokers counselled	14	8531	Odds Ratio (M‐H, Random, 95% CI)	2.28 [1.41, 3.67]
3.1 Duration 40 minutes to 2 hours	8	4220	Odds Ratio (M‐H, Random, 95% CI)	3.25 [1.67, 6.33]
3.2 Duration >2 to 4 hours	3	2482	Odds Ratio (M‐H, Random, 95% CI)	1.57 [0.86, 2.86]
3.3 Duration >4 hours	3	1829	Odds Ratio (M‐H, Random, 95% CI)	1.29 [0.99, 1.68]
4 Number of smokers receiving self‐help material	9	4925	Odds Ratio (M‐H, Random, 95% CI)	3.52 [1.56, 7.91]
4.1 Duration 40 minutes to 2 hours	5	2192	Odds Ratio (M‐H, Random, 95% CI)	3.16 [0.77, 13.07]
4.2 Duration >2 to 4 hours	3	2482	Odds Ratio (M‐H, Random, 95% CI)	3.54 [1.84, 6.83]
4.3 Duration >4 hours	1	251	Odds Ratio (M‐H, Random, 95% CI)	21.82 [1.50, 317.23]
5 Number of smokers receiving nicotine gum/replacement therapy	9	5073	Odds Ratio (M‐H, Random, 95% CI)	1.57 [0.72, 3.42]
5.1 Duration 40 minutes to 2 hours	5	3164	Odds Ratio (M‐H, Random, 95% CI)	2.33 [0.73, 7.43]
5.2 Duration >2 to 4 hours	3	1334	Odds Ratio (M‐H, Random, 95% CI)	0.87 [0.52, 1.45]
5.3 Duration >4 hours	1	575	Odds Ratio (M‐H, Random, 95% CI)	1.14 [0.67, 1.95]