Table 1.

Characteristics of patients from control and test sites who agreed to participate in follow-up^*

Variable	Baseline period			Intervention period
	Control sites (n = 509)	Test sites (n = 513)	P	Control sites (n = 499)	Test sites (n = 642)	P
Mean age, y (SD)	41.9 (16)	43.5 (14)	.09	39.9 (15)	42.8 (15)	.001
Male, %	44	47	.24	44	45	.81
Mean years of education, y (SD)	12.3 (1.8)	12.6 (1.7)	.001	12.3 (1.5)	12.6 (1.7)	.005
Very good or excellent health, %	38	37	.89	38	35	.23
No. of cigarettes smoked per day, median (IQR)	15 (10–20)	20 (10–20)	.08	15 (10–20)	20 (10–20)	.04
Consumed alcohol within the past 3 months, %	67	66	.86	63	64	.67
Another smoker in household, %	49	50	.80	46	48	.53

^*Comparisons were based on the Pearson chi-square test for categorical variables and student’s test for continuous variable (age); Wilcoxon’s rank sum test was used for variables with highly skewed distributions (highest grade, number of cigarettes smoked per day). SD = standard deviation; IQR = interquartile range.