Table 4.

Associations of Ever and Past-30-day Joint Distribution of E-cigarette and Cigarette Use, Marijuana Use, and Covariates with Asthma in Multiple Logistic Regression

	Model A: Ever use			Model B: Past-30-day use
Variables	AOR	95% CI	p	AOR	95% CI	p
E-cigarettes only	1.16	1.01–1.33	0.04	1.29	1.07–1.55	0.01
Cigarettes only	1.01	0.81–1.25	0.96	1.23	0.92–1.64	0.17
Both e-cigarettes and cigarettes	1.13	0.97–1.31	0.11	1.62	1.32–1.99	<0.0001
Marijuana	1.12	0.99–1.27	0.07	1.08	0.94–1.24	0.25
Covariates
Gender (ref.: Female)	1.02	0.92–1.12	0.72	1.01	0.92–1.11	0.86
Overweight (ref.: No)	1.23	1.08–1.40	0.002	1.25	1.10–1.42	0.0005
Obese (ref.: No)	1.52	1.34–1.74	<0.0001	1.48	1.30–1.68	<0.0001
Age	0.99	0.95–1.03	0.52	1.00	0.96–1.04	0.88
NH Asian (ref. NH white)	0.67	10.51–0.85	0.005	0.73	0.56–0.94	0.02
NH black (ref. NH white)	1.45	1.25–1.65	<0.0001	1.45	1.28–1.64	<0.0001
Hispanic (ref. NH white)	0.76	0.64–0.91	0.02	0.76	0.63–0.91	0.01
Hispanic multi-race (ref. NH white)	1.06	0.92–1.23	0.40	1.13	0.98–1.30	0.09
NH multi-race (ref. NH white)	1.75	1.44–2.11	<0.0001	1.84	1.53–2.22	<0.0001

Note: NH: Non-Hispanic. All variables entered in model simultaneously. Indices for tobacco product groups are binary (0,1) variables based on ever use (Model A) or use in past 30 days (Model B); reference group = didn’t use either.