Table 3.

Bivariate analysis^* of ever e-cigarette use among current smokers only (N=772; 82 e-cigarette users [10.6%])

Covariate	OR*	95% CI for OR	p-value
Age (years)	0.93	(0.85, 1.02)	0.132
Male vs. Female	1.95	(1.22, 3.12)	0.005
Year in school			0.155 (df=3)
Freshman (reference)	-	-	-
Sophomore	1.46	(0.77, 2.78)	0.250
Junior	1.30	(0.69, 2.45)	0.425
Senior/5th yr.	0.68	(0.32, 1.43)	0.305
Race & Ethnicity			0.524 (df=4)
White (reference)	-	-	-
Asian/Pacific Islander	2.16	(0.45, 10.4)	0.336
Black	0.41	(0.05, 3.11)	0.389
Hispanic	1.08	(0.24, 4.80)	0.920
Other	1.88	(0.69, 5.10)	0.216
Mother’s education
Some college or less (reference)	-	-	-
College degree or higher	1.41	(0.88, 2.26)	0.147
Father’s education
Some college or less (reference)	-	-	-
College degree or higher	1.05	(0.66, 1.66)	0.850
Greek vs. Non-Greek	1.22	(0.67, 2.22)	0.514
Off-campus vs. On-campus residence	0.93	(0.59, 1.47)	0.750
Sensation seeking	1.75	(1.24, 2.48)	0.002
Lifetime hookah use: Yes vs. No	1.48	(0.85, 2.60)	0.166
Current binge drinking: Yes vs. No	1.85	(1.01, 3.36)	0.045
Current marijuana use: Yes vs. No	1.60	(0.98, 2.61)	0.060
Lifetime other illegal drug use: Yes vs. No	1.74	(1.10, 2.76)	0.019
E-cigarette harm perception			<0.001 (df=3)
As harmful as cigarette (reference)	-	-	-
Less harm than cigarette	1.30	(0.70, 2.42)	0.412
More harmful than cigarette	3.67	(1.18, 11.4)	0.025
Don’t know	0.23	(0.10, 0.52)	<0.001
Cigarette smoking quit intentions   Not thinking of quitting vs. Any intentions	1.13	(0.68, 1.87)	0.633
Type of Institution
Public (reference)	-	-	-
Private	1.59	(0.85, 2.96)	0.144

^*OR is odds ratio (unadjusted for other covariates); Each variable is the only covariate present in each bivariate mixed-effects logistic regression model presented above.