A cross-sectional study of secondhand smoke exposure and respiratory symptoms in non-current smokers in the U.S. trucking industry: SHS exposure and respiratory symptoms

Table 2 Association between SHS exposure and respiratory symptoms among 1,562 non-smoking workers ^a

SHS exposure	Chronic cough		Chronic phlegm		Any wheeze
	OR	95% CI	OR	95% CI	OR	95% CI
Total recent exposure ^b
Exposed to SHS in past 7 days	1.46	1.00 - 2.13	1.55	1.08 - 2.21	1.76	1.41 - 2.21
Current exposure by location ^b,c
Recent workplace exposure^d	1.74	1.14 - 2.67	1.75	1.16 - 2.65	1.20	0.90 - 1.60
Recent home exposure^e	0.74	0.37 - 1.48	0.76	0.41 - 1.42	0.90	0.60 - 1.35
Recent recreational exposure^f	0.91	0.55 - 1.50	1.24	0.74 - 2.09	2.03	1.45 - 2.83
Childhood exposure
Lived with ≥1 smoker during childhood	1.21	0.81 - 1.80	1.84	1.24 - 2.75	1.16	0.91 - 1.47
Life-time home exposure
Less than 10 years	Ref	--	Ref	--	Ref	--
10-19 years	1.39	0.84 - 2.31	1.86	1.15 - 3.03	1.21	0.90 - 1.63
20-29 years	1.75	1.04 - 2.94	1.92	1.16 - 3.18	1.17	0.85 - 1.60
at least 30 years	1.35	0.79 - 2.32	1.91	1.15 - 3.17	1.30	0.94 - 1.79
	p trend = 0.29		p trend = 0.02		p trend = 0.12

^a Logistic regression models adjusted for age, sex, race, job title, former smoking, pack-years, years since quitting, BMI, region of country, and urban residence among never smokers or former smokers who quit at least 10 years before completing the questionnaire.
^b Additionally adjusted for childhood exposure to SHS.
^c Location specific exposures were all modeled simultaneously.
^d Exposure at work in the past 2 work days.
^e Recent exposure at home in an average week.
^f Recent exposure outside of home and work in an average week.
Note: trend analyses are estimated using the median value of each category.

ISSN: 1471-2458