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Relation between left ventricular ejection fraction (LVEF) and the negative predictive values of normal ECG and CTR < 0.5 separately and combined for predicting left ventricular dysfunction
| LVEF | Normal ECG (%) (n = 586) | Normal chest radiograph (CTR <0.5) (%) (n = 472) | Normal ECG and chest radiograph (%) (n = 340) |
| <50% | 80.5 | 82.2 | 87.9 |
| ⩽45% | 86.3 | 87.5 | 92.9 |
| ⩽40% | 91.5 | 93.4 | 97.4 |
| ⩽35% | 96.4 | 97.7 | 99.1 |
