Table 3.

Results of logistic modelling of rates of validated smoking cessation according to heaviness of smoking and initial stage of change

Intervention	Heaviness of smoking						Initial stage of change
	<20 cigarettes per day			⩾20 cigarettes per day			Pre-contemplator			Contemplator or preparer
	Regression ratio (95% CI)	P value		Regression ratio (95% CI)	P value		Regression ratio (95% CI)	P value		Regression ratio (95% CI)	P value
Tailored letter v control	1.69 (0.89 to 3.22)	0.11		0.80 (0.24 to 2.67)	0.72		1.78 (0.73 to 4.30)	0.20		1.17 (0.55 to 2.46)	0.69
Non-tailored letter v control	1.87 (1.00 to 3.46)	0.05		1.16 (0.36 to 3.69)	0.81		1.47 (0.59 to 3.66)	0.41		1.85 (0.93 to 3.66)	0.08