Figure 3 Concordance index of (A) major adverse cardiac and cerebrovascular events and (B) all-cause mortality predicted by model A and model B during the follow-up period. Created with R software (version 4.1.3; The R foundation for Statistical Computing, Vienna, Austria). Model A was fitted with age, BMI, albumin, C-reactive protein levels, and multivessel which have been proven to have prognostic value. Model B was a new model that introduced the De Ritis ratio to model A. BMI – body mass index; CRP – C-reactive protein; Alb – serum albumin; Multivessel – multivessel lesion.