Table 4.
Ability of TSB measurements over the 50th, the 75th and the 90th percentile of TSB nomogram to predict significant hyperbilirubinaemia, for designated time periods.
| Hours of age | TP (n) |
FN (n) |
TN (n) |
FP (n) |
Sensitivity (%) |
Specificity (%) |
PPV (%) |
NPV (%) |
|---|---|---|---|---|---|---|---|---|
| 24 to 48 hours | ||||||||
| < 50th percentile | 24 | 1 | 357 | 263 | 96.0 | 57.6 | 8.4 | 99.7 |
| < 75th percentile | 22 | 3 | 479 | 141 | 88.0 | 77.3 | 13.5 | 99.4 |
| < 90th percentile | 12 | 13 | 576 | 44 | 48.0 | 92.9 | 21.4 | 97.8 |
| 49 to 72 hours | ||||||||
| < 50th percentile | 23 | 0 | 657 | 368 | 100 | 64.1 | 5.9 | 100 |
| < 75th percentile | 22 | 1 | 860 | 165 | 95.7 | 83.9 | 11.8 | 99.9 |
| < 90th percentile | 17 | 6 | 975 | 50 | 73.9 | 95.1 | 25.4 | 99.4 |
| 73 to 96 hours | ||||||||
| < 50th percentile | 7 | 0 | 322 | 145 | 100 | 69.0 | 4.6 | 100 |
| < 75th percentile | 7 | 0 | 409 | 58 | 100 | 87.6 | 10.8 | 100 |
| < 90th percentile | 6 | 1 | 446 | 21 | 85.7 | 95.5 | 22.2 | 99.8 |
TP True Positive; FN False Negative; TN True negative; FP False Positive; PPV Positive Predictive Value; NPV Negative Predictive Value