Cut-off points
Sensitivity %
Specifity %
PPV % NPV %
Correctly classified %
κϮ
p
<17 89.1 68.4 65.0 90.5 84.3 0.564 <0.001
<18 81.2 73.7 53.8 91.2 79.5 0.486 <0.001
<19 75.0 78.9 48.4 92.3 75.9 0.441 <0.001
<20 71.9 89.5 48.6 95.8 75.9 0.473 <0.001
<21 65.6 89.4 43.6 95.5 71.1 0.402 <0.001
<22 50.0 94.7 36.0 97.0 60.2 0.284 <0.001
<23 39.1 94.7 31.6 96.2 51.8 0.198 0.005
<24 25 94.7 27.3 94.1 41.0 0.106 0.061