TABLE 2. COHORT DESCRIPTORS.

Characteristics of PPHN cases and mothers of cases.

NEONATAL CHARACTERISTICS	n=88
Male	59 (67%)
Birth weight	3512 +/−596 grams
Gestational Age	38.3 +/−1.8 weeks
Caucasian	78 (89%)
Postdate (>40weeks)	11 (13%)
Premature (<37 weeks)	18 (20%)
APGAR <7 at 5 minutes	16 (18%)
Pneumonia	19 (22%)
Pneumothorax	26 (30%)
Meconium Aspiration	21 (24%)
Large for Gestational Age	31 (35%)
Discharge on Oxygen	13 (15%)
MATERNAL CHARACTERISTICS
Maternal Age at Delivery	28.9 +/−5.7 years
Cesearan Section Mode of Delivery	45 (51%)
Complications of Delivery	39 (44%)
Group B Strep Positive	10 (11%)
History of Depression	9 (10%)
SSRI Treatment during Pregnancy	4 (5%)
COHORT DESCRIPTORS
Triads (proband + mother + father)	72 (82%)
Diads (proband + 1 parent)	16 (18%)
Treated with iNO &/or ECMO	60 (68%)
UICH Hospital of Birth	23 (26%)
Families with >1 case infant	3 (3%)