When this model was tested in the validation cohort , it performed well in terms of discrimination and calibration abilities ( C-index = 0.760 [ 0.693-0 .828 ] and Nam and D'Agostino ( 2 ) statistic = 0.001 for 3 years ; C-index = 0.782 [ 0.719-0 .846 ] and Nam and D'Agostino ( 2 ) statistic = 1.037 for 5 years ) .