CCTA ( > 50 % stenosis considered positive ) had 288 negative studies and 18/35 ( 51 % ) positive studies with a sensitivity of 100 % [ CI : 81.5 , 100 ] , specificity of 94 % [ CI : 91.2 , 96.7 % ] , and ROC of 0.97 [ CI : 0.92 , 1.0 ; p = 0.2 ] .