Table 2. Clinical Characteristics of study population.
| Clinical Characteristics (n=174)* | |
|---|---|
| Demographics: | |
| Age at menarche (year) | 12.5± 2 |
| Year of birth | 1973± 9 |
| Genetics: | |
| Genotype positive | 129(74) |
| - LQT1 | 62(36) |
| - LQT2 | 65(37) |
| - LQT4 | 1(0.57) |
| - LQT10/LQT11 | 1(0.57) |
| Genotype negative for known mutations | 20(12) |
| Genotype missing (not tested) | 25(14) |
| History: | |
| Patients with cardiac events prior to menarche | 18(14) |
| Family History: Sudden cardiac death before age 40 | 41(24) |
| ECG: | |
| QTc-interval value (msec)† | 492±45 |
| Number of births | 2 ± 2 |
| Oral contraceptive use at any time | 147 |
| Generation of first oral contraceptive used: | |
| 1st generation | 27(18) |
| 2nd generation | 18(12) |
| 3rd generation | 41(28) |
| 4th generation | 8(5) |
| Unknown | 53(36) |
Values are Mean ± SD where indicated. Numbers in parentheses are percent (%).
†
First measurements recorded in LQTS Registry.