Table 5.
Stability and diagnostic classification parameters at different ages.
| True Positive (n = 98) |
False Positive (n = 41) |
False Negative (n = 4) |
True Negative (n = 4) |
Sensitivity | Specificity | Positive Predicted Value | Negative Predicted Value | |
|---|---|---|---|---|---|---|---|---|
| 18–24 months (n = 50) |
30 | 18 | 1 | 1 | 96.77% | 5.26% | 62.50% | 50% |
| 25–35 months (n = 86) |
61 | 20 | 3 | 2 | 95.31% | 9.09% | 75.30% | 40% |
| 36–48 months (n = 11) |
7 | 3 | 0 | 1 | -- | -- | -- | -- |
Note: TP = True Positive, FP = False Positive, FN = False Negative, TN = True Negative; sensitivity is calculated as TP/(TP + FN) × 100; specificity is calculated as TN/(TN + FP) × 100; Positive Predicted Value (PPV) is calculated as TP/(TP + FP) × 100; Negative Predicted Value (NPV) is calculated as TN/(TN + FN) × 100.