Table 2.

Distributions of key measures

	Full Sample (N=173)			E-Cigarette Only Users (N=144)
	M (SD)	Median	Range	M (SD)	Median	Range
Cotinine	38.4 (92.0)	2.1	0 – 864.6	27.5 (89.7)	0.0	0 – 864.6
Ln Cotinine*	1.8 (2.0)	1.1	0 – 6.8	1.3 (1.8)	0.0	0 – 6.8
Days per month*	15.4 (9.8)	15.0	0 – 30.0	14.2 (9.6)	12.0	0 – 30.0
SPD	3.2 (5.6)	1.4	0 – 54.1	2.4 (3.6)	1.1	0 – 25.0
Ln SPD*	1.1 (0.8)	0.9	0 – 4.0	0.9 (0.7)	0.8	0 – 3.3
SPM	74.7 (167.1)	17.3	0 – 1624.3	52.5 (103.1)	13.4	0 – 725.0
Ln SPM*	3.0 (1.7)	2.9	0 – 7.4	2.7 (1.6)	2.7	0 – 1.6
ECDI*	3.4 (3.9)	2.0	0 – 16.0	2.7 (3.3)	1.0	0 – 15.0
EASI*	24.6 (25.0)	17.0	0 – 100.0	20.7 (22.9)	11.0	0 – 100.0
HVI*	1.8 (2.3)	1.0	0 – 10.0	1.5 (2.0)	1.0	0 – 9.0

^*Used in analyses

Note: SPD = Sessions per Day, SPM = Sessions per Month, ECDI = Penn State Electronic Cigarette Dependence Index, EASI = E-cigarette Addiction Severity Index, HVI = Heaviness of Vaping Index