Table 3.

Adjusted odds ratios (OR) relating past-30-day e-cigarette use to respiratory symptoms, from mixed-effect logistic regression models.

Model	Wheeze	Bronchitic Symptoms	Shortness of Breath
Concurrent wave e-cigarette use (lag 0)	OR (95%CI)	OR (95%CI)	OR (95%CI)
Model 1a	1.81 (1.28, 2.56)	2.06 (1.58, 2.69)	1.78 (1.23, 2.57)
Model 2b	1.41 (0.99, 2.01)	1.55 (1.18, 2.05)	1.48 (1.01, 2.18)
Prior wave e-cigarette use (lag 1)
Model 1a	2.17 (1.41, 3.35)	1.51 (1.07, 2.14)	1.59 (1.08, 2.34)
Model 2b	1.77 (1.14, 2.74)	1.23 (0.86, 1.74)	1.41 (0.96, 2.09)

Note.

^a= Model included participant-level random intercept and adjustment for wave, age, sex, race, and parental education.

^b= additional adjustment for concurrent (lag 0) use of cigarettes, cannabis, and secondhand exposure to e-cigarettes, cigarettes, and cannabis.