The number of valid leads for QT dispersion measurements in each position
| Supine | Sitting | Standing | Inspiration | Expiration | Supine-B | Standing-B | |
|---|---|---|---|---|---|---|---|
| Global | 10.23 (0.60) | 10.22 (0.55) | 9.69 (1.33)1-150 | 10.13 (0.57) | 10.17 (0.56) | 10.14 (0.53) | 9.52 (1.51)1-150 |
| Precordial | 4.96 (0.26) | 4.96 (0.15) | 4.81 (0.57) | 4.95 (0.25) | 4.95 (0.25) | 4.97 (0.16) | 4.69 (0.78) |
Values are mean (SD).
↵1-150 p < 0.01 v all other positions.
B, study B; Global, global QT dispersion or global QT standard deviation; Precordial, precordial QT dispersion or precordial QT standard deviation.