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Demographics of our genotype negative LQTS cohort
| Number of Probands | 39 |
| Age at Diagnosis, years ± SD | 20 ± 18 |
| Range | 0-65 |
| < 5 years of age (%) | 10 (26) |
| ≥ 5 years of age (%) | 29 (74) |
| Males (%) | 16 (41) |
| QTc, ms ± SEM | 538 ± 13 |
| Syncope (%) | 15 (38) |
| Cardiac Arrest (%) | 14 (36) |
| Positive Family History (%) | 14 (36) |
