The value of CTX-M and NoC to predict beta-lactam resistant E coli Value Sen (%) Spe (%) PPV (%) NPV (%) Accu (%) ESBL CTX-M 86.6 54.2 72.5 74.3 73.0 NoC 89.6 54.2 73.2 78.8 74.8 CTX CTX-M 85.2 67.6 86.3 65.7 80.0 NoC 87.7 67.6 86.6 69.7 81.7 CAZ CTX-M 84.9 43.5 56.3 77.1 62.6 NoC 86.4 41.9 56.1 78.8 62.6 FEP CTX-M 90.2 45.6 50.0 88.6 62.4 NoC 92.7 44.1 50.0 90.9 62.4 AMC CTX-M 66.7 28.4 40.0 54.3 44.3 NoC 70.8 28.4 41.5 57.6 46.1 TZP CTX-M 72.7 31.2 20.0 82.9 39.1 NoC 72.7 29.0 19.5 81.8 37.4 15 The value of CTX-M to predict cephalosporin resistance was 84.9% - 90.2% sensitivity; however, the specificity was from 43.5% to 67.6%.