Table 3.

Outcomes (frequency and incidence rate) (n = 524)

Variables	Statistics** (incidence rate)
Age at last echocardiogram (years)	13.4 (8.6–16.6)
Length of follow-up (years)	3.2 (0.0–6.4)
Maximal LV wall or IVS z-score >2	80 (3.62)
Primary outcome—earliest event
Major cardiac event	17 (0.77)
Death	3 (0.14)
Heart transplant	0 (0.00)
Aborted sudden cardiac death	2 (0.09)
ICD implantation (all primary indication)	7 (0.32)
Myectomy	5 (0.23)
Other outcomes
Abnormal blood pressure response on exercise test	16 (0.73)
Non-sustained ventricular tachycardia on Holter	7 (0.32)
Coronary unroofing	3 (0.14)
Maximal LV wall or septal Z-score >5	49 (2.22)
Maximal LV wall or septal Z-score >10	13 (0.59)
LV outflow gradient >30 mmHg	13 (0.59)
LV outflow gradient >50 mmHg	10 (0.45)
LV outflow gradient >100 mmHg	9 (0.41)