Figure 2
Model to show how different quartiles of admission diurnal temperature range (DTR) moderated the association between serum calcium concentration and in-hospital mortality of patients with acute myocardial infarction. β1 = age, gender, current smoking, current alcohol use, diabetes mellitus, high-density lipoprotein cholesterol, uric acid, serum phosphate, serum potassium, left ventricular ejection fraction and left atrial diameter. β2 = the independent effect of diurnal temperature range (DTR) on in-hospital mortality after adjusting for the above covariates. β3 = the interaction effect of serum calcium concentration and DTR on in-hospital mortality after adjusting for the above covariates. r = correlation between serum calcium concentration and DTR. *P < 0.05.
