Table 1.

Study Population

N	2159
Hospitals	40
Age at admission (days)	0 (IQR: 0–1)
Female sex	32% (685)
Race
White	63% (1,368)
Black	7% (146)
Asian	3% (59)
Other/missing	27% (586)
Payer
Private	47% (1022)
Medicaid	43% (917)
Other government	5% (108)
Other	5% (105)
Prematurity
26–30 weeks gestation	0.2% (5)
31–34 weeks gestation	2% (53)
35–39 weeks gestation	15% (314)
Term	83% (1787)
Non-cardiac congenital anomaly	5% (104)
Balloon atrial septostomy	49% (1131)
Prostaglandin infusion	60% (1294)
Mechanical ventilation/respiratory support	37% (802)
Inotropes	1% (20)
Age at arterial switch operation	6 (IQR: 4–9)

Abbreviations: IQR interquartile range