Nakao et al2 | 230 men | Consecutive, unexplained hypertrophy (IVS and/or PW ⩾13 mm) | 62 (13) (55–72) | 7 (3.0%) |
Sachdev et al3 | 74 men | HCM diagnosed at <40 years of age (maximum wall thickness ⩾13 mm) | 26 (9) (8–39) | 1 (1.4%) |
| 79 men | HCM diagnosed at ⩾40 years of age (maximum wall thickness ⩾13 mm) | 53 (8) (40–71) | 5 (6.3%) |
Arad et al11 | 75 (45 men) | Unexplained hypertrophy—HCM (wall thickness ⩾13 mm) | ND (12–75) | 0 (0%) |
| 20 (NG) | HCM—massive LVH (wall thickness ⩾30 mm) | ND (9–58) | 0 (0%) |
| 24 (NG) | HCM with pre-excitations (short PR, delta wave) | ND (8–42) | 0 (0%) |
Ommen et al9 | 100 (44 men) | Consecutive patients referred for septal myotomy—myectomy for LVOT obstruction | 45 (17) at diagnosis (ND) | 0 (0%) |
Chimenti et al4 | 34 women | Consecutive, unexplained LVH (wall thickness ⩾13 mm) | 50 (14) (ND) | 4 (12%) |
| 62 men | Unexplained LVH (wall thickness ⩾13 mm) | ND | 2 (3.3%) |