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Risk factor distribution at entry according to QTcmax (<480 ms v ⩾480 ms)
| Risk factor | QTcmax <480 ms (n = 114) | QTcmax ⩾480 ms (n = 77) | p Value |
| Smoking | |||
| Never | 34% | 31% | 0.950 |
| Current | 34% | 41% | |
| Former | 32% | 28% | |
| Male sex | 75% | 42% | <0.001 |
| Family history | 40% | 51% | 0.124 |
| Hypertension | 39% | 43% | 0.350 |
| Age (years) | 51.42 | 54.23 | 0.027 |
