Examples of sensitivity and specificity of various cut off values for predicting cardiac death within eight years from each measurement
| Parameter | Cut off value | Sensitivity (%) | Specificity (%) | Area under ROC curve |
|---|---|---|---|---|
| ROC, receiver operating characteristic. | ||||
| QTcmax (ms) | ||||
| Baseline | 475 | 89 | 42 | 0.71 |
| Baseline | 480 | 65 | 50 | – |
| 3 years | 470 | 90 | 57 | 0.80 |
| 3 years | 480 | 79 | 70 | – |
| 3 years | 490 | 58 | 75 | – |
| 6 years | 480 | 92 | 59 | 0.84 |
| QTc, 6 years (ms) | 510 | 83 | 85 | 0.70 |
| ABPI ratio, 3 years | 1.16 | 71 | 50 | – |
| RR ratio | ||||
| 6 years | 1.13 | 83 | 53 | 0.72 |
| 6 years | 1.19 | 67 | 75 | 0.79 |
| QTcmax (ms) and ABPI ratio, 3 years | 495/1.18 | 73 | 63 | 0.90 |
| QTcmax (ms) and RR ratio, 6 years | 503/1.05 | 83 | 75 | – |