Results
asthma, COPD
COPD, ASTHMA
High exposure had a hazards ratio (HR) of 1.34 (1.11–1.62) and asthma and COPD coexistence of 1.58 (1.10–2.27). The combined effects of intermediate exposure and coexistence had an HR of 2.20 (1.18–4.09), high exposure with coexistence of 1.94 (1.10–3.42) for overall mortality, and sub-HR for respiratory-related mortality of 3.21 (1.87–5.50).