Discrimination of the eight-variable model [ including age , sex , estimated glomerular filtration rate ( eGFR ) , albuminuria , calcium , phosphate , bicarbonate , albumin ] was similar to that of the four-variable model ( including age , sex , eGFR , albuminuria ) and the three-variable model ( including age , sex , eGFR ) ; ROC-AUCs were 0.89 [ 95 % confidence interval ( CI ) 0.86-0 .92 ] , 0.88 ( 95 % CI 0.85-0 .91 ) and 0.88 ( 95 % CI 0.85-0 .92 ) , respectively .
