| Risk Factor | Adjusted HR |
| Recent syncopal events vs. no events in the past 10 years: | |
 2 syncopal events in past 2 years |
18.1 |
| 1 syncopal event in past 2 years | 11.7 |
| 2 syncopal events in past 10 years and none in past 2 years |
5.8 |
| 1 syncopal event in past 10 years and none in past 2 years | 2.7 |
| Males aged 10–12 years vs. age-matched females | 4.0 |
| QTc 530 ms vs. QTC <530 ms |
2.3 |