Relative Risk of Myocardial Infarction per 1°C Change in Diurnal Temperature Range (DTR) above the Threshold Temperature in All Regions by Season.

Model adjusted for precipitation, humidity, sea level pressure, and air pollutants (PM10, NO2) using a spline function. RR = Relative risk. STEMI: ST elevation myocardial infarction. Non-STEMI: Non-ST elevation myocardial infarction. Spring: March–May, Summer: June–August, Autumn: September–November, Winter: December–February. *P<0.05; ** P<0.001. aThreshold temperature. bNo threshold effect was identified.