Mean QT intervals per population demographic
| Characteristic | QTc (ms) Mean (SD) | Difference (95% CI) | |
|---|---|---|---|
| Sex | |||
| Male | 409.1 (23.1) | −10.0 (−10.7 to −9.3) | p<0.001 |
| Female | 419.1 (22.1) | ||
| Ethnicity | |||
| Caucasian | 412.7 (22.8) | 16.5 (14.9 to 18.0) | p<0.001 |
| Afro-Caribbean | 396.2 (25.6) | ||
| Athletic status | |||
| Athlete | 409.7 (23.2) | −4.1 (−4.8 to −3.5) | p<0.001 |
| Non-athlete | 413.8 (23.2) | ||
QT, QT interval corrected for heart rate.