Table 3.
Receiver operator characteristic (ROC) curve of C-ACT score performance in classifying treatment change categories (well controlled v/s all other categories) in 105 children with asthma
| Cut-point value of C-ACT score | Sensitivity % | Specificity % | Youden index | Correctly classified % | Positive likelihood ratio | Negative likelihood ratio |
|---|---|---|---|---|---|---|
| 9 | 98.48 | 5.13 | 0.0361 | 63.81 | 1.0381 | 0.2955 |
| 11 | 98.48 | 7.69 | 0.0617 | 64.76 | 1.0669 | 0.197 |
| 12 | 96.97 | 7.69 | 0.0466 | 63.81 | 1.0505 | 0.3939 |
| 13 | 93.94 | 12.82 | 0.0676 | 63.81 | 1.0775 | 0.4727 |
| 14 | 92.42 | 17.95 | 0.1037 | 64.76 | 1.1264 | 0.4221 |
| 15 | 92.42 | 23.08 | 0.155 | 66.67 | 1.2015 | 0.3283 |
| 16 | 90.91 | 25.64 | 0.1655 | 66.67 | 1.2226 | 0.3545 |
| 17 | 86.36 | 28.21 | 0.1457 | 64.76 | 1.2029 | 0.4835 |
| 18 | 84.85 | 48.72 | 0.3357 | 71.43 | 1.6545 | 0.311 |
| 19 | 78.79 | 58.97 | 0.3776 | 71.43 | 1.9205 | 0.3597 |
| 20 | 69.70 | 69.23 | 0.3893 | 69.52 | 2.2652 | 0.4377 |
| 21 | 65.15 | 76.92 | 0.4207 | 69.52 | 2.8232 | 0.453 |
| 22 | 53.03 | 84.62 | 0.3765 | 64.76 | 3.447 | 0.5551 |
| 23 | 37.88 | 89.74 | 0.2762 | 57.14 | 3.6932 | 0.6922 |
| 24 | 31.82 | 94.87 | 0.2669 | 55.24 | 6.2045 | 0.7187 |
| 25 | 21.21 | 97.44 | 0.1865 | 49.52 | 8.2727 | 0.8086 |
| 26 | 10.61 | 97.44 | 0.0805 | 42.86 | 4.1364 | 0.9175 |
| 27 | 7.58 | 97.44 | 0.0502 | 40.95 | 2.9545 | 0.9486 |
Area under ROC curve = 0.75, SE = 0.05, 95 confidence intervals 0.65–0.84
C-ACT Childhood Asthma Control Test