Discrete data were summarized as frequencies, and continuous data were expressed as mean ± SD or median and interquartile range as appropriate. The chi-square test was used for comparison of categorical variables, and the unpaired 2-tailed Student t test or Mann-Whitney rank sum test was used to test differences among continuous variables. Survival curves were generated with the use of the Kaplan-Meier method, and the difference between groups was assessed by log-rank test. The multivariable analysis for the primary endpoint was performed by the forward stepwise Cox proportional hazards model, whereas for angiographic restenosis, analysis was by forward stepwise logistic regression. The following variables were tested: age (years), male sex, diabetes mellitus, EuroSCORE, previous MI, right coronary artery chronic total occlusion, left main stenting of both branches, minimal lumen diameter post-PCI (mm), maximum pressure inflation (atm), completeness of revascularization, year of the index procedure, and EES. Interaction between EES and year of the index procedure was tested with the Cox regression model. A propensity score–matched analysis (1:1) was also performed because of expected differences in baseline characteristics between patients receiving EES and patients receiving PES due to broader indication to PCI in the last years. An optimal data-matching technique was performed using the propensity score as calipers. Propensity score analysis was performed with the use of a logistic regression model from which the probability for the use of EES was calculated for each patient. The variables entered into the model were: age (years), male sex, serum creatinine >150 μmol/l, history of MI, left ventricular ejection fraction <40%, peripheral vascular disease, EuroSCORE, left main stenting of both branches, and left main stent length >24 mm. Model discrimination was assessed with the c-statistic and goodness of fit with the Hosmer-Lemeshow test. All tests were 2-sided, and a p value <0.05 was considered significant. Analyses were performed using the software package SPSS version 11.5 (SPSS, Chicago, Illinois).