Table 1.

Participant characteristics at baseline

	Low-level smokers: 1–5 cigarettes/day (n = 81)	Light smokers: 6–10 cigarettes/day (n = 99)	Moderate/heavy smokers: ≥11 cigarettes/day (n = 100)	p value
Demographic variable
Age, years (SD)	40.7 (13.0)	40.9 (9.8)	43.1 (11.3)	.265
Gender (percent male)	53.1	50.5	59.0	.469
Education (percent)
<High school	43.2	49.5	56.0
≥High school to some college	39.5	42.4	35.0
≥College	17.3	8.31	9.0	.185
Marital status (percent married)	73.8	62.6	70.0	.258
Household income (percent <US$20,000)	58.0	59.4	46.4	.143
Ethnicity (percent Mexican origin)	59.3	69.7	70.0	.233
Time in the United States (percent >10 years)	51.9	59.6	64.0	.252
Language spoken at home (percent Spanish only)	64.2	63.6	59.0	.719
Single-item tobacco-dependence variable
Average number of cigarettes/day (SD)	3.4 (1.4)	8.6 (1.6)	19.7 (7.8)	<.001
Number of years smoked (SD)	19.5 (11.0)	21.7 (9.1)	24.5 (1.08)	.005
Time to first cigarette (percent ≤5 min)	6.2	12.1	28.3	<.001
Treatment group (percent enhanced)	46.9	53.5	50.0	.674

Note. The p values for continuous variables are based on analysis of variance tests for differences between groups based on smoking level; p values for categorical variables are based on chi-square tests for differences between groups based on smoking level.