Table 2.
Global ECG measures
| Derivation (n=22,096) |
Validation (n=11,048) |
|
|---|---|---|
| Ventricular rate (beats per minute) | 65 (59, 71) | 65 (59, 71) |
| Median PR duration (ms) | 158 (144, 172) | 156 (144, 172) |
| Median QT duration (ms) | 400 (382, 418) | 400 (382, 418) |
| Median QTc interval (ms) | 413 (406, 423) | 413 (406, 423) |
| Median P wave axis (degrees) | 54 (42, 65) | 55 (42, 65) |
| Median QRS axis (degrees) | 27 (8, 48) | 27 (8, 48) |
| Median T wave axis (degrees) | 40 (28, 51) | 40 (28, 51) |
| SDNN (ms) | 16 (11, 25) | 17 (11, 25) |
| RMS-SD (ms) | 17 (11, 26) | 17 (11, 26) |
Variables are medians (25th to 75th percentile)