Table 1.

Study population characteristics

	Nonusers	EC Users	TC Smokers	P Value	Total
Sample size, n	41	34	35		110
Age, yr	24.4 ± 4.4	23.2 ± 2.6	24.2 ± 3.0	0.2992	23.9 ± 3.5
Sex (female/male), n	21/20	17/17	21/14	0.6547	59/51
BMI, kg/m2	22.3 ± 3.1	22.9 ± 2.6	21.8 ± 2.4	0.1270	22.3 ± 2.7
College education, n
Yes	41	34	35		110
No	0	0	0	1.000	0
Cotinine, ng/mL	<2	60.5 [12.3–170.0]	56.0 [10.5–138.0]	0.6084*	X

Values are means ± SD or medians [interquartile ranges, Q1–Q3]; n, number of participants. BMI, body mass index; EC, electronic cigarette; TC, tobacco cigarette. *E-cigarette users vs. smokers.