Table 1.

Participant Characteristics (n=1,125)

Characteristic	n	%
Sex
Male	561	49.9
Female	564	50.1
Age: mean (sd)	15.1 (1.4)
Race/Ethnicity
Non-Hispanic White	859	76.4
Non-Hispanic other race	182	16.2
Hispanic	84	7.5
Mother’s education
High school or less	218	19.4
Some college or Associate’s degree	186	16.5
Bachelor’s degree or more	545	48.4
Don’t know	176	15.6
Region
Northeast	154	13.7
Midwest	285	25.3
South	545	48.4
West	141	12.5
Cigarette smoking
Never smoker	1004	89.2
Ever smokera	80	7.1
Current smokerb	41	3.6
E-cigarette use
Never user	958	85.2
Ever usera	109	9.7
Current userb	58	5.2

Note. Missing values (<.1% of the sample) were recoded to mean or mode.

^aAt least 1 time but not in past 30 days.

^bAt least 1 time in past 30 days.