Table 5 Sensitivity, Specificity, PPV, NPV, Accuracy and Youden’s index of IDRS and CBAC to diagnose any NCD (diabetes and/or hypertension)
Score | SN (%) | SP (%) | PPV (%) | NPV (%) | Accuracy (%) | Youden’s index |
|---|---|---|---|---|---|---|
IDRS | ||||||
 ≥ 10 | 99.3 | 1.6 | 32.0 | 83.3 | 32.7 | 0.01 |
 ≥ 20 | 98.6 | 2.4 | 32.0 | 78.9 | 33.0 | 0.01 |
 ≥ 30 | 96.9 | 7.1 | 32.7 | 83.3 | 35.7 | 0.04 |
 ≥ 40 | 90.8 | 19.9 | 34.6 | 82.4 | 42.5 | 0.11 |
 ≥ 50 | 83.4 | 36.2 | 37.8 | 82.4 | 51.2 | 0.20 |
 ≥ 60 | 63.1 | 60.0 | 42.4 | 77.7 | 61.0 | 0.23 |
 ≥ 70 | 33.9 | 80.3 | 44.4 | 72.3 | 65.5 | 0.14 |
 ≥ 80 | 11.9 | 92.9 | 43.8 | 69.3 | 67.1 | 0.05 |
 ≥ 90 | 0.3 | 99.5 | 25.0 | 68.2 | 68.0 | 0.00 |
 ≥ 100 | 0.0 | 99.8 | 0.0 | 68.2 | 68.1 | 0.00 |
CBAC | ||||||
 ≥ 1 | 99.3 | 3.3 | 32.4 | 91.3 | 33.8 | 0.03 |
 ≥ 2 | 96.6 | 11.5 | 33.7 | 88.0 | 38.6 | 0.08 |
 ≥ 3 | 83.1 | 28.3 | 35.1 | 78.2 | 45.7 | 0.11 |
 ≥ 4 | 65.4 | 52.4 | 39.1 | 76.5 | 56.6 | 0.18 |
 ≥ 5 | 38.6 | 75.0 | 41.9 | 72.4 | 63.5 | 0.14 |
 ≥ 6 | 17.6 | 91.0 | 47.7 | 70.3 | 67.7 | 0.09 |
 ≥ 7 | 6.1 | 97.0 | 48.6 | 68.9 | 68.1 | 0.03 |
 ≥ 8 | 1.0 | 99.1 | 33.3 | 68.2 | 67.9 | 0.00 |
 ≥ 9 | 0.0 | 99.8 | 0.0 | 68.2 | 68.1 | 0.00 |