Demographic, clinical and echocardiographic characterisation of the patients
| Frequency (percentage) or mean±standard deviation | Range | |
|---|---|---|
| Age at initial evaluation (years) | 46±15 | 5–76 |
| Male | 165 (74) | |
| Ethnicity—Caucasian | 180 (80.7) | |
| Family history HCM | 82 (37) | |
| NYHA class III or IV | 26 (12) | |
| Maximal left ventricular wall thickness (mm) | 19.5±4.6 | 11–35 |
| Left atrial diameter (mm) | 45±7 | 31–63 |
| Left ventricular end-diastolic diameter (mm) | 45.4±6.1 | 29–68 |
| Left ventricular end-systolic diameter (mm) | 27.3±6.1 | 12–50 |
| Fractional shortening (%) | 40.3±8.9 | 16–69 |
HCM: hypertrophic cardiomyopathy; NYHA: New York Heart Association.