Table 3.

Adjusted odds ratio of e-cigarette susceptibility among middle and high school students who are never users of e-cigarettes, National Youth Tobacco Survey, United States, 2014–2018.

	Adjusted odds ratio (95%CI)
Year	2014	2015	2016	2017	2018
Sex
Female	1.18 (1.09, 1.27)	1.29 (1.17, 1.43)	1.14 (1.05, 1.25)	1.23 (1.12, 1.36)	1.21 (1.09,1.34)
Male (REF)	1.00	1.00	1.00	1.00	1.00
Race/ethnicity
NH-black	0.63 (0.55, 0.73)	0.60 (0.52, 0.70)	0.59 (0.50, 0.70)	0.59 (0.50, 0.71)	0.58 (0.48, 0.69)
NH-White	0.67 (0.59, 0.76)	0.65 (0.57, 0.75)	0.68 (0.60, 0.78)	0.80 (0.69, 0.92)	0.88 (0.77, 1.00)
NH-other	0.84 (0.73, 0.98)	0.79 (0.64, 0.97)	0.84 (0.68,1.04)	0.82 (0.64, 1.05)	0.86 (0.69, 1.08)
Hispanic (REF)	1.00	1.00	1.00	1.00	1.00
School
Middle	1.03 (0.91, 1.17)	0.93 (0.81, 1.06)	0.97 (0.85, 1.10)	0.99 (0.88, 1.12)	0.98 (0.85, 1.12)
High (REF)	1.00	1.00	1.00	1.00	1.00
OTP ever use
Yes	2.62 (2.38, 2.87)	2.60 (2.17, 3.11)	2.62 (2.25, 3.05)	2.60 (2.17, 3.13)	2.71 (2.31, 3.18)
No (REF)	1.00	1.00	1.00	1.00	1.00
E-cigarette harm perception
No harm (REF)	1.00	1.00	1.00	1.00	1.00
Little harm	0.74 (0.62, 0.89)	1.03 (0.86, 1.23)	1.14 (0.93, 1.39)	1.22 (0.93, 1.60)	1.51 (1.24, 1.84)
Some harm	0.32 (0.27, 0.38)	0.43 (0.36, 0.52)	0.52 (0.44, 0.63)	0.55 (0.42, 0.71)	0.60 (0.48, 0.74)
A lot of harm	0.13 (0.13, 0.16)	0.17 (0.14, 0.21)	0.20 (0.17, 0.24)	0.21 (0.15, 0.28)	0.23 (0.18, 0.29)

REF = reference, 95% CI = 95% confidence interval. Odds ratio adjusted for other covariates.