Table 3 Sensitivity, Specificity, PPV, NPV, Accuracy and Youden’s index of IDRS and CBAC to diagnose diabetes
Score | Screen Positive | SN (%) | SP (%) | PPV (%) | NPV (%) | Accuracy (%) | Youden’s index |
|---|---|---|---|---|---|---|---|
IDRS | |||||||
 ≥ 10 | 98.7 | 98.8 | 1.3 | 9.3 | 91.7 | 10.3 | 0.00 |
 ≥ 20 | 98.0 | 97.6 | 2.0 | 9.2 | 89.5 | 10.9 | 0.00 |
 ≥ 30 | 94.3 | 96.5 | 6.1 | 9.5 | 94.4 | 14.5 | 0.03 |
 ≥ 40 | 83.5 | 91.8 | 17.5 | 10.2 | 95.4 | 24.4 | 0.09 |
 ≥ 50 | 70.0 | 89.4 | 32.1 | 11.8 | 96.8 | 37.4 | 0.22 |
 ≥ 60 | 47.3 | 67.1 | 55.2 | 13.2 | 94.3 | 56.3 | 0.22 |
 ≥ 70 | 24.4 | 36.5 | 77.1 | 14.0 | 92.3 | 73.3 | 0.14 |
 ≥ 80 | 8.7 | 15.3 | 92.0 | 16.3 | 91.4 | 84.9 | 0.07 |
 ≥ 90 | 0.4 | 1.2 | 99.6 | 25.0 | 90.8 | 90.5 | 0.01 |
 ≥ 100 | 0.1 | 0.0 | 99.9 | 0.0 | 90.7 | 90.6 | 0.00 |
CBAC | |||||||
 ≥ 1 | 97.6 | 98.8 | 2.6 | 9.4 | 95.7 | 11.5 | 0.01 |
 ≥ 2 | 91.1 | 96.5 | 9.6 | 9.8 | 96.4 | 17.6 | 0.06 |
 ≥ 3 | 75.3 | 84.7 | 25.7 | 10.4 | 94.3 | 31.1 | 0.10 |
 ≥ 4 | 53.3 | 65.9 | 48.1 | 11.5 | 93.3 | 49.7 | 0.14 |
 ≥ 5 | 29.3 | 38.8 | 71.7 | 12.3 | 92.0 | 68.7 | 0.11 |
 ≥ 6 | 11.9 | 16.5 | 88.7 | 13.0 | 91.2 | 82.0 | 0.05 |
 ≥ 7 | 4.0 | 8.2 | 96.4 | 18.9 | 91.2 | 88.2 | 0.05 |
 ≥ 8 | 1.1 | 2.4 | 99.2 | 22.2 | 90.9 | 90.2 | 0.02 |
 ≥ 9 | 0.1 | 0.0 | 99.9 | 0.0 | 90.7 | 90.6 | 0.00 |