Table 1. Primary Cohort Characteristics (n = 81 unrelated probands).

Male (n) (%)	43 (53.1%)
Mean Age at Screening (years)	14.3 ± 13
ATRIOVENTRICULAR SEPTAL DEFECT TYPE	n	%
Partial	34	42.0
Complete	23	28.4
Unbalanced	11	13.6
Intermediate	10	12.3
Unknown	3	3.7
OTHER ASSOCIATED CARDIAC LESIONS	n	%
None	49	60.5
Left Sided Lesion	18	22.2
Arterial or Venous Anomaly	6	7.4
Right Sided Lesion	4	4.9
Conotruncal	3	3.7
Unknown	1	1.2
EXTRACARDIAC ANOMALIES	18	22.2
FAMILY HISTORY OF CONGENITAL HEART DISEASE	10	12.3