Fig. 1
Adjusted odds ratios for important characteristics according to short-term PM2.5 exposure levels before ICCU admissions. Adjusted odds ratios (aORs) were estimated by logistic regression models, controlling for mean temperature (per 5 °C increase) and relative humidity (per 10% increase). Short-term PM2.5 exposure, the 2-day average PM2.5 concentration before ICCU admission. PM2.5, particulate matter with an aerodynamic diameter less than 2.5 μm; STEMI, ST-segment elevation myocardial infarction; ARF, acute respiratory failure; AKI, acute kidney injury; GIH, gastrointestinal hemorrhage; CVC, central venous catheter; OASIS, Oxford Acute Severity of Illness Score; ANCI, major acute noncardiovascular critical illness, defined as the composite of acute respiratory failure, acute kidney injury, sepsis, or gastrointestinal hemorrhage; Primary endpoint, the composite of all-cause death or discharge against medical advice in extremely critical condition