For example, in the cohort of lifetime residents, the effects of NO 2 on asthma were positive and almost significant (odds ratio (OR) = 1.28, 95% CI: 0.97–1.69), but in the stratified cohort, NO 2 was significantly associated with asthma among children with above-median ETV (OR = 2.33, 95% CI: 1.47–3.71), but not the children with below-median ETV (OR = 0.87, 95% CI: 0.59–1.28).
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Non-chemical stressors and cumulative risk assessment: an overview of current initiatives and potential air pollutant interactions.
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