Use of electronic cigarettes and secondhand exposure to their aerosols are associated with asthma symptoms among adolescents: a cross-sectional study

Table 3 Associations between frequency of exposure to household secondhand aerosols (SHA) from electronic cigarettes in the past 7 days and asthma symptoms

	Current wheeze		Current asthma		Current uncontrolled asthma symptoms
Household secondhand aerosol exposure in past 7 days	% (n/total)	aPR* (95% CI)	% (n/total)	aPR* (95% CI)	% (n/total)	aPR* (95% CI)
No exposure (0 days)	24.1 (215/894)	1.00 (Reference)	14.1 (124/894)	1.00 (Reference)	12.0 (107/894)	1.00 (Reference)
Infrequent exposure (1–2 days)	30.3 (40/132)	1.17 (0.87–1.58)	22.7 (30/132)	1.49 (1.01–2.23)	18.9 (25/132)	1.53 (1.00–2.33)
Frequent exposure (≥ 3 days)	38.8 (120/309)	1.30 (1.04–1.59)	27.2 (84/309)	1.56 (1.13–2.16)	27.8 (86/309)	1.88 (1.35–2.62)

aPR: adjusted prevalence ratio; CI: confidence interval
* Adjusted for sex, age, cigarette smoking status, electronic cigarette use status, exposure to household secondhand smoke, and exposure to secondhand smoke and/or secondhand aerosols from electronic cigarettes in public places

ISSN: 1465-993X