Table 2.

Results of logistic modelling of validated smoking cessation (n=2553)

	Unadjusted			Adjusted
	Regression ratio (95% CI)	P value		Regression ratio (95% CI)	P value
Intervention:
Tailored letter v no letter	1.37 (0.78 to 2.39)	0.28		1.39 (0.79 to 2.46)	0.25
Non-tailored letter v no letter	1.72 (1.01 to 2.94)	0.05		1.66 (0.96 to 2.86)	0.07
Age (v +10 years)*	1.05 (0.88 to 1.24)	0.62		1.12 (0.94 to 1.34)	0.20
Males v females	1.35 (0.88 to 2.06)	0.17		1.46 (0.94 to 2.27)	0.09
Level of social deprivation:
1 v 5	2.53 (1.20 to 5.34)	0.02		2.07 (0.97 to 4.44)	0.06
2 v 5	1.93 (1.02 to 3.66)	0.04		1.63 (0.85 to 3.14)	0.14
3 v 5	0.55 (0.07 to 4.24)	0.56		0.49 (0.06 to 3.84)	0.50
4 v 5	1.32 (0.66 to 2.64)	0.43		1.17 (0.58 to 2.36)	0.67
Time to first cigarette (minutes):
6-30 v <5	1.32 (0.74 to 2.34)	0.34		1.02 (0.56 to 1.85)	0.95
31-60 v <5	1.24 (0.55 to 2.78)	0.61		0.78 (0.33 to 1.84)	0.57
>60 v <5	3.60 (1.94 to 6.66)	0.0001		2.40 (1.21 to 4.76)	0.01
Heaviness of smoking†:
<20 v ⩾20/day	0.59 (0.35 to 1.01)	0.05		0.74 (0.41 to 1.34)	0.32
Initial stage of change**:
Contemplator or preparer v pre-contemplator	3.49 (2.26 to 5.40)	0.0001		3.22 (2.06 to 5.02)	0.0001

^*Age was modelled as a continuous variable, the relative risk being calculated for an increase in age of 10 years. 

^†Test for heaviness of smoking by group interaction: P=0.26. 

^**Test for initial stage of change by group interaction: P=0.38.