Table 1. Demographic and clinical characteristics of study population for genotyping phase.

	Cases (n=94)
Infant Characteristics
Male gender	61 (65)
Caucasian race	83 (88)
Birth weight (g)	3532 (+/-626)
Gestational age (weeks)	38.3 (+/-1.8)
Postdate (>40 weeks)	13 (17)
Premature (<37 weeks)	19 (20)
Apgar <7 at 5 min	18 (19)
Meconium aspiration	26 (28)
Pneumothorax	28 (30)
Pneumonia	19 (20)
Treated with iNO	66 (70)
ECMO	9 (10)
Maternal Characteristics
Maternal age (years)	28.7 (+/-5.7)
Cesarean section	50 (53)
Complications of delivery	45 (48)
Cohort descriptors
Triads (infant, mother and father)	77 (82)
UIHC hospital of birth	24 (26)