Table 2.
Clinical event detection.
| High heart rate | Low heart rate | High respiratory rate | Low respiratory rate | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pre-A | Pre-H | Post | Pre-A | Pre-H | Post | Pre-A | Pre-H | Post | Pre-A | Pre-H | Post | |
| Event | ||||||||||||
| True positive | 65 | 60 | 72 | 0 | 0 | 0 | 634 | 407 | 506 | 10 | 1 | 1 |
| True negative | 1458 | 1206 | 1206 | 1529 | 1251 | 1251 | 292 | 198 | 198 | 653 | 279 | 293 |
| False positive | 26 | 15 | 10 | 3 | 3 | 3 | 29 | 42 | 12 | 90 | 14 | 1 |
| False negative | 20 | 14 | 7 | 1 | 1 | 1 | 411 | 83 | 14 | 12 | 6 | 5 |
| Statistical summary | ||||||||||||
| Accuracy | 97% | 98% | 99% | 100% | 100% | 100% | 68% | 83% | 96% | 87% | 93% | 98% |
| Sensitivity | 77% | 81% | 90% | 0% | 0% | 0% | 61% | 83% | 97% | 46% | 14% | 17% |
| Specificity | 98% | 99% | 99% | 100% | 100% | 100% | 91% | 83% | 94% | 88% | 95% | 100% |
| PPV | 71% | 80% | 86% | 0% | 0% | 0% | 96% | 91% | 97% | 10% | 7% | 50% |
| NPV | 99% | 99% | 99% | 100% | 100% | 100% | 42% | 71% | 93% | 98% | 98% | 98% |
| FN:FP | 1:1.3 | 1:1.1 | 1:1.4 | 1:3 | 1:3 | 1:3 | 1: 0.1 | 1:0.5 | 1:0.9 | 1:7.5 | 1:2.3 | 1:0.2 |
Pre-adjudication with adequate signal quality analysis (Pre-A); pre-adjudication with higher signal quality analysis (Pre-H); post-adjudication (Post); positive predictive value (PPV); negative predictive value (NPV); false negative event to false positive event ratio (FN:FP).
Accuracy = (True positive + True negative)/(True positive + True negative + False negative + False positive); Sensitivity = True positive/(True positive + False negative); Specificity = True negative/(True negative + False positive); PPV = True positive/(True positive + False positive); NPV = True negative/(True negative + False negative).