Multivariate Cox regression for prognostic factors of under-70 group patients. Multivariate Cox regressions were performed for fatality risk factors of symptoms, chronic medical illness, complications, elevated myocardial enzymes (A) and other laboratory findings (B) identified in the univariate Cox regression analysis. Elevated myocardial enzymes were defined if serum LDH or CK was above the upper reference limit. Data are represented as mean with a 95% confidence interval. Abbreviations: CI, confidence interval; CRP, C-reactive protein; CK, creatine kinase; LDH, lactate dehydrogenase; Cr, creatinine.