Table 4 Sensitivity, Specificity, PPV, NPV, Accuracy and Youden’s index of IDRS and CBAC to diagnose hypertension
Score | SN (%) | SP (%) | PPV (%) | NPV (%) | Accuracy (%) | Youden’s index |
|---|---|---|---|---|---|---|
IDRS | ||||||
 ≥ 10 | 99.6 | 1.6 | 25.9 | 91.7 | 26.8 | 0.01 |
 ≥ 20 | 99.2 | 2.4 | 26.0 | 89.5 | 27.3 | 0.02 |
 ≥ 30 | 97.5 | 6.9 | 26.6 | 88.9 | 30.1 | 0.04 |
 ≥ 40 | 90.9 | 19.0 | 28.0 | 85.8 | 37.5 | 0.10 |
 ≥ 50 | 82.6 | 34.4 | 30.3 | 85.2 | 46.8 | 0.17 |
 ≥ 60 | 63.6 | 58.3 | 34.5 | 82.3 | 59.7 | 0.22 |
 ≥ 70 | 35.5 | 79.4 | 37.4 | 78.1 | 68.2 | 0.15 |
 ≥ 80 | 12.8 | 92.7 | 37.8 | 75.5 | 72.2 | 0.06 |
 ≥ 90 | 0.0 | 99.4 | 0.0 | 74.2 | 73.9 | -0.01 |
 ≥ 100 | 0.0 | 99.9 | 0.0 | 74.3 | 74.2 | 0.00 |
CBAC | ||||||
 ≥ 1 | 99.6 | 3.1 | 26.2 | 95.7 | 27.9 | 0.03 |
 ≥ 2 | 97.1 | 11.0 | 27.4 | 91.7 | 33.1 | 0.08 |
 ≥ 3 | 83.9 | 27.7 | 28.6 | 83.3 | 42.1 | 0.12 |
 ≥ 4 | 67.4 | 51.6 | 32.5 | 82.0 | 55.6 | 0.19 |
 ≥ 5 | 40.5 | 74.6 | 35.5 | 78.4 | 65.8 | 0.15 |
 ≥ 6 | 19.0 | 90.6 | 41.1 | 76.4 | 72.2 | 0.10 |
 ≥ 7 | 6.6 | 96.9 | 42.1 | 75.0 | 73.7 | 0.04 |
 ≥ 8 | 1.2 | 99.0 | 30.0 | 74.4 | 73.9 | 0.00 |
 ≥ 9 | 0.0 | 99.9 | 0.0 | 74.3 | 74.2 | 0.00 |