Table 1.

Demographic and Clinical Data

	Historical Cohort (n=406)	SCAMP Cohort (n=364)	P value
Male (n, %)	207 (51)	187 (51)	0.94
Age (median, range in y)	13.7 (7–21)	13 (7–19)	0.07
Age 7–11, y (%)	118 (29)	137 (38)	<0.0001
Age 12–16, y (%)	184 (45)	179 (49)
Age 17–21, y (%)	104 (26)	48 (13)
Exertional chest pain	151 (37%)	141 (39%)	0.71
Associated palpitations	66 (16%)	90 (25%)	0.004
Positive past medical history*	2 (0.5%)	5 (1%)	0.27
Positive family history†	4 (1%)	9 (2%)	0.16
Abnormal physical examination‡	6 (1%)	3 (1%)	0.51
Abnormal ECG¶	12 (3%)	5 (1%)	0.15

SCAMP indicates Standardized Clinical Assessment and Management Plans.

^*Positive past medical history indicates: systemic arthritis/vasculitis, hypercoaguable state, or prolonged immobilization.

^†Positive family history indicates: sudden or unexplained death, cardiomyopathy, or a hypercoaguable state in first-degree relative.

^‡Abnormal physical examination indicates: pathological murmur, gallop, pericardial friction rub, abnormal second heart sound, distant heart sounds, peripheral edema, painful or swollen extremities, tachypnea, or fever.

^¶Abnormal ECG indicates: ventricular hypertrophy, pathological ST-segment or T-wave changes (>2 mm), high-grade atrioventricular block, ventricular or atrial ectopy, low QRS voltages, PR segment depression, S1/Q3/inverted T3, or prolonged QTc>470 ms.