Table 1.
Patient characteristics in the internal dataset at the time of ECG and echocardiogram acquisition
| Training dataset (n = 29 907) | Test dataset (n = 7196) | P-value | |
|---|---|---|---|
| Age (years) | 63.3 (17.0) | 63.5 (16.7) | 0.295 |
| Male, n (%) | 16 886 (56.5) | 4139 (57.5) | 0.107 |
| Body height (cm) | 161.7 (9.9) | 161.8 (10.0) | 0.808 |
| Body weight (kg) | 59.9 (13.6) | 60.3 (13.6) | 0.068 |
| LVEF (%) | 61.2 (14.7) | 60.9 (15.2) | 0.064 |
| Reduced LVEF, n (%) | 2764 (9.2) | 737 (10.2) | 0.010 |
| HR (/min) | 74.0 (15.4) | 74.1 (15.1) | 0.543 |
| PR interval (ms) | 171.5 (43.9) | 169.9 (43.9) | 0.007 |
| QRS duration (ms) | 105.8 (22.6) | 106.1 (22.6) | 0.232 |
| QT interval (ms) | 396.9 (40.0) | 396.9 (39.3) | 0.956 |
| QTc | 435.0 (34.1) | 435.6 (35.0) | 0.142 |
| QRS axis | 28.1 (45.3) | 28.5 (44.5) | 0.429 |
| P axis | 41.5 (34.8) | 41.6 (33.9) | 0.782 |
Data are presented as n (%) or mean (standard deviation). P-values are from unpaired Student’s t-tests or the χ2 test and indicate differences in the distribution of values between the training and test datasets.
ECG, electrocardiogram; LVEF, left ventricular ejection fraction; HR, heart rate; QTc, corrected QT interval.