Results and conclusion: On analyzing age group 15 years, we observed association of motor
vehicle air pollution [Odds ratio (OR) ¼ 2.7; 95% Confidence Interval (CI) ¼ 1.4e5.3;
P value ¼ 0.003], industrial smoke [OR ¼ 2.9; 95%CI ¼ 1.3e6.9; P ¼ 0.013], and exposure to
ETS [OR ¼ 6.6; 95%CI ¼ 4.1e10.7; P < 0.001] with asthma as compared to controls. On
analyzing age group > 15 years, we also observed an association of factors motor vehicle air
pollution [OR ¼ 1.6; 95%CI ¼ 1.1e2.6; P ¼ 0.029], industrial smoke [OR ¼ 2.7; 95%CI ¼ 1.2e5.8;
P ¼ 0.012], current smoking [OR ¼ 2.6; 95%CI ¼ 1.7e3.8; P < 0.001] and passive smoking
[OR ¼ 2.4; 95%CI ¼ 1.6e3.6; P < 0.001] to be associated with asthma. For severity association
we did “case only” analysis and observed only factor “hospitalization of asthma” to be
statistically significantly associated with the severity of disease (P < 0.05).
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