Table 3. Factors affecting second-hand smoke exposure among non-smokers at the workplace as per GATS India rounds I& II, India.

	SHS exposure at Workplace Adjusted Prevalence Ratio (95% CI)
	GATS-I	GATS–II
Age Groups
Between 15–30 years	1.2 (1.1–1.4)	1.2 (1.0–1.3)
Between 31–45 years	1.1 (0.9–1.2)	1.1 (0.9–1.2)
Above 45 years (Ref)	1	1
Sex
Male	1.5 (1.3–1.6)	1.8 (1.6–1.9)
Female	1	1
Education
No formal education	1.6 (1.4–1.9)	1.6 (1.4–1.9)
Less than primary	1.7 (1.4–2.0)	1.6 (1.5–2.0)
Primary but less than secondary	1.4 (1.2–1.6)	1.5 (1.3–1.6)
Secondary and above	1	1
Employment
Govt/ Pvt. Employees	1.5 (1.3–1.6)	1.7 (1.5–1.9)
Self employed	0.8 (0.6–1.1)	1.7 (1.5–1.9)
Student	2.1 (1.5–2.8)	1.4 (1.1–1.8)
Others	1	1
Place of residence
Urban	1	1
Rural	1.1 (0.9–1.2)	1.3 (1.1–1.4)
Wealth-index quintile
Poor	1.2 (1.1–1.4)	1.1 (1.0–1.3)
Middle	1.1 (0.9–1.2)	1.1 (1.0–1.2)
Rich	1	1
Region
North	0.8 (0.7–0.9)	1.2 (1.0–1.3)
Central	1.0 (0.9–1.2)	1.1 (0.9–1.2)
East	0.9 (0.8–1.1)	0.9 (0.8–1.1)
North East	1.7 (1.4–1.9)	1.1 (0.9–1.2)
West	0.7 (0.6–0.9)	0.8 (0.6–0.9)
South	1	1
Knowledge smoking cause stroke
Yes	1	1
No	1.0 (0.9–1.1)	0.9 (0.8–1.0)
Knowledge smoking cause a heart attack
Yes	1	1
No	1.3 (1.1–1.4)	1.0 (0.9–1.2)
Knowledge of smoking lung cancer
Yes	1	1
No	0.8 (0.6–1.1)	1.3 (0.6–1.0)
Knowledge smoking causes serious illness
Yes	1	1
No	1.2 (0.9–1.5)	0.9 (0.7–1.0)