Table 2 Confusion matrices for each stage of validation
A) Device #1 Retrospective | Predicted Label | |||
|---|---|---|---|---|
Thresh = 0.0303 | No Alert − 0 | Alert − 1 | ||
True Label | No Alert − 0 | 14308 | 11889 | Specificity: 0.55 |
Alert − 1 | 213 | 3317 | Sensitivity: 0.94 | |
NPV: 0.99 | PPV: 0.22 | |||
B) Device #1 Prospective | Predicted Label | |||
Thresh = 0.0352 | No Alert − 0 | Alert − 1 | ||
True Label | No Alert − 0 | 2653 | 2128 | Specificity: 0.55 |
Alert − 1 | 14 | 480 | Sensitivity: 0.97 | |
NPV: 0.99 | PPV: 0.18 | |||
C) Alternate Device #2 | Predicted Label | |||
Thresh = 0.0291 | No Alert − 0 | Alert − 1 | ||
True Label | No Alert − 0 | 33957 | 4633 | Specificity: 0.88 |
Alert − 1 | 280 | 597 | Sensitivity: 0.68 | |
NPV: 0.99 | PPV: 0.11 | |||
