*2.8. Statistical Analysis*

Continuous variables are presented as mean ± standard deviation, and medians and ranges as appropriate. Categorical variables are given as frequencies and percentages. Statistical analyses were conducted with the use of the JMP software (version 13; SAS Institute, Cary, NC, USA). Receiver operating characteristic curve analysis was performed to determine the optimum cutoff levels of the number of derivations obtained from electrocardiogram and echocardiographic data to predict MACEs. A *p*-value of <0.05 was considered statistically significant.
