Table 1.

Baseline characteristics of study participants.

	All CHD (n=247)	SV (n=114)	d-TGA (n=92)	ToF (n=41)	Non-CHD (n=94)
Variables	Mean (SD), Number (%), or Median [IQR]
Gestational age, weeks	39.3 (2.1)	38.8 (2.4)	39.9 (1.3)	39.4 (2.4)	39.6 (1.2)
Self-reported white race	221 (89)	107 (94)	81 (88)	33 (80)	75 (80)
Family social class	48.4 (12.9)	48.9 (13.8)	47.1 (12.5)	50.4 (10.9)	53.4 (9.9)
Genetic diagnosis	16 (6)	10 (9)†	0	6 (15)‡	-
Age at first operation, days	7 [4, 47]	6 [3, 27]	6 [4, 9]	163 [76, 337]	-
DHCA duration, minutes	35 (25)*	39 (29)§	36 (22)	26 (26)**	-
Total support time, minutes	129 (40)*	125 (49)§	142 (31)	96 (27)**	-
Number of perioperative complications	1 [0, 2]	1 [0, 2]	1 [0, 2]	0 [0, 1]	-
Any neurological event	51 (21)	26 (23)	20 (22)	5 (12)	-
Number of catheterizations	2 [1, 4]	4 [3, 5]	1 [0, 1]	1 [0, 2]	-
Number of operations	2 [1, 3]	3 [3, 3]	1 [1, 1]	1 [1, 2]	-
Age at MRI, years	15.0 (2.2)	14.8 (3.0)	15.7 (0.8)	14.4 (1.0)	15.1 (1.9)

CHD: congenital heart disease, DHCA: deep hypothermic circulatory arrest, d-TGA: d-transposition of the great arteries, MRI: magnetic resonance imaging, SV: single ventricle, ToF: Tetralogy of Fallot

All variables are missing <3% unless otherwise noted.

^*Data is missing for 23 out of 247 participants (9%) and not relevant for 49 participants undergoing closed surgery.

^†Previously known genetic/phenotypic syndromes included VACTERL (n=1), VATER (n=1), 22q11 (n=1), CHARGE syndrome (n=1), Kartagener syndrome (n=1), Factor V Deficiency (n=1), Factor V Leiden Deficiency (n=1), Factor VII Deficiency (n=1), balanced translocation involving chromosomes 13 and 14 (n=1) and unspecified (n=1).

^§Data missing for 14 of 65 participants (22%) undergoing open surgery and not relevant for 49 participants undergoing closed surgery.

^‡Previously known genetic/phenotypic syndromes included 22q11 (n=1), VATER (n=2), VACTERL (n=2), and Alagille syndrome (n=1).

^**Data missing for 9 out of 41 participants (22%).