Table 2. Correlates of Self-Reported Exposure to Secondhand Smoke and Secondhand Aerosol From E-Cigarettes in Public Places During the Past 30 Days Among US Middle and High School Students, National Youth Tobacco Survey, 2017^a .

Characteristic	SHS Exposureb	SHA Exposurec	Exposure to Either SHS or SHAd	Exposure to SHS Onlye	Exposure to SHA Onlyf	Exposure to Both SHS and SHAg
Sex
Male	Reference
Female	1.35 (1.29–1.41)h	1.33 (1.23–1.43)h	1.29 (1.24–1.35)h	1.40 (1.32–1.48)h	1.22 (1.04–1.41)h	1.58 (1.44–1.72)h
School level
Middle school (grades 6–8)	Reference
High school (grades 9–12)	1.13 (1.06–1.20)h	1.20 (1.08–1.31)h	1.15 (1.08–1.21)h	1.16 (1.07–1.25)h	1.54 (1.23–1.85)h	1.27 (1.13–1.41)h
Race/ethnicity
Non-Hispanic white	Reference
Non-Hispanic black	0.75 (0.68–0.81)h	0.65 (0.57–0.72)h	0.75 (0.69–0.81)h	0.74 (0.66–0.83)h	0.61 (0.45–0.77)h	0.57 (0.50–0.64)h
Hispanic	0.91 (0.85–0.97)h	0.97 (0.88–1.05)	0.92 (0.86–0.97)h	0.87 (0.79–0.95)h	0.95 (0.73–1.16)	0.92 (0.84–1.00)
Non-Hispanic other	0.98 (0.89–1.07)	0.88 (0.75–1.01)	0.96 (0.88–1.04)	0.99 (0.87–1.10)	0.76 (0.48–1.04)	0.90 (0.76–1.03)
E-cigarette usei
Not current user	Reference
Current user	1.20 (1.10–1.30)h	2.90 (2.67–3.12)h	2.89 (2.67–3.12)h	0.79 (0.64–0.94)h	4.87 (3.76–5.99)h	2.25 (2.04–2.46)h
Other tobacco product usej
Noncurrent user	Reference
Current user	1.25 (1.17–1.33)h	1.37 (1.23–1.52)h	1.21 (1.13–1.29)h	1.24 (1.11–1.38)h	1.09 (0.81–1.39)	1.49 (1.32–1.66)h
Tobacco product use by household member(s)k
No tobacco products	Reference
Combustible, only	1.42 (1.35–1.49)h	0.98 (0.89–1.07)	1.35 (1.30–1.41)h	1.68 (1.58–1.78)h	1.09 (0.87–1.32)	1.30 (1.18–1.42)h
Smokeless only	1.09 (0.95–1.22)	1.10 (0.93–1.26)	1.09 (0.97–1.20)	1.13 (0.92–1.34)	1.25 (0.83–1.68)	1.11 (0.91–1.32)
E-cigarettes, only	1.08 (0.96–1.21)	3.08 (2.72–3.44)h	1.60 (1.47–1.73)h	0.56 (0.26–0.85)h	7.46 (5.88–9.03)h	2.36 (2.00–2.72)h
Other combination	1.63 (1.53–1.74)h	1.82 (1.59–2.05)h	1.63 (1.53–1.73)h	1.92 (1.75–2.10)h	3.00 (1.86–4.15)h	2.32 (2.07–2.58)h

Abbreviations: SHA, secondhand aerosol; SHS, secondhand smoke.

^a N = 17,872. Values are adjusted prevalence ratio (95% confidence interval).

^b A response other than 0 days to the question, “During the past 30 days, on how many days did you breathe the smoke from someone who was smoking tobacco products in an indoor or outdoor public place?” Respondents with missing data (n = 819) were excluded.

^c A response other than 0 days to the question, “During the past 30 days, on how many days did you breathe the vapor from someone who was using an electronic cigarette or e-cigarette in an indoor or outdoor public place?” Respondents with missing data (n = 811) were excluded.

^d Respondents who reported exposure to SHS or SHA during the past 30 days.

^e Respondents who reported exposure to SHS but no exposure to SHA in past 30 days.

^f Respondents who reported exposure to SHA but no exposure to SHS in past 30 days.

^g Respondents who reported exposure to SHS and exposure to SHA in past 30 days.

^h Significant differences in the estimate compared with the reference group, based on multivariable logistic regression modeling (P < .05). Each column represents a separate model of reporting the specified outcome adjusted for each variable listed.

ⁱ Current users reported use on ≥1 days of the past 30 days; noncurrent users reported use of e-cigarettes on 0 days.

^j Includes cigarettes; cigars, cigarillos, or little cigars; chewing tobacco, snuff, or dip; pipe filled with tobacco; bidis; snus; dissolvable tobacco; or hookah or waterpipe. Current users reported use of one or more of these products on ≥1 days of the past 30-days. Noncurrent users reported using all tobacco products on 0 days.

^k No tobacco products = no use of tobacco products by a household member reported; combustible tobacco products, only = reported use by a household member of cigarettes, cigars, little cigars, cigarillos, pipe, hookah, or bidis; smokeless tobacco products only = reported use by a household member of chewing tobacco, snuff or dip, snus, or dissolvable tobacco products; e-cigarettes only = reported use by a household member of e-cigarettes; other combination = reported use by a household member of any other combination of combustible, smokeless, or electronic tobacco products. Respondents with missing data (n = 1,058) on tobacco product use by household member(s) were excluded.