Table 1.

Sample characteristics (%) of students and schools: Orange County (OC), CA

	Middle school students (n=23,091)	High school students (n=44,610)
Student characteristics
Ever used e-cigarette (lifetime use)	13.4	27.5
Used e-cigarette past 30 days (current use)	7.6	13.7
Behavioral risk factors
Ever used combustible tobacco	5.2	15.2
Ever drank at least 1 alcoholic drink	12.0	36.9
Ever used marijuana	6.8	24.8
Sociodemographic Characteristics
Gender
Male	49.0	48.6
Female	51.0	51.4
Race-ethnicity
non-Hispanic White	17.4	23.2
Hispanic	47.6	46
Black	1.3	1.4
Asian	17.9	17.7
Other	15.7	11.6
Parent education
College grad	39.4	45.1
< College	29.4	40.3
Missing/Don’t know	31.3	14.7
School characteristics	Middle schools (n=77)	High schools (n=53)
Percent of schools with retailer within 1/4 mile	3.9	9.4
Mean percent of students eligible for free/reduced price lunch program (FRLP)	52.6	47.6

Source: Authors’ calculations using data from the 2013–2014 California Healthy Kids Survey & OC E-cigarette Retailer Study.

Note: Middle school includes grade 7, high school includes grades 9 and 11.