Table 1 Characteristics of the Full Site Cohort.

Birth weight (g), mean (SD)

970 (295)

<10th percentile weight (Fenton)

17

Gestational age (weeks), mean (SD)

26.3 (1.55)

< 26 weeks at birth

67 (35%)

Sex (female)

85 (46%)

Multiple gestation

57 (29.8%)

Born outside study center

30 (15.7%)

Clinical chorioamnionitis

7 (3.6%)

Histological chorioamnionitis

7 (3.6%)

Antenatal steroids: none

13 (6.8%)

Antenatal steroids: complete courses only, mean (SD)

127 (66.4%)

Mode of birth: c-section

120 (62.8%)

     Asian

14 (7.3%)

     Black

43 (22.5%)

     North American Indian/Native Alaskan

4 (2.0%)

     Other

12 (6.2%)

     Unknown

44 (23.0%)

     White

74 (38.7%)

Maternal Ethnicity: Hispanic

29 (15.1%)

Maternal age (years), mean (SD)

31 (6.0)

Baby’s health insurance: Medicaid/public

74 (38.7%)

Baby’s health insurance: private

115 (60.2%)

Maternal hypertension

43 (22.5%)

Maternal hypertension: pre-existing

21 (10.9%)

Maternal asthma during pregnancy

15 (7.8%)

Antepartum hemorrhage

9 (4.7%)

Medications to prolong pregnancy

101 (52.8%)

Maternal tobacco smoking

3 (1.5%)

Maternal opiates

2 (1.0%)

Apgar 1 min, mean (SD)

4 (2.2)

Apgar 5 min, mean (SD)

6 (2.0)

Resuscitation at birth: bag & mask

144 (75.3%)

Resuscitation at birth: intubation

107 (56.0%)

Resuscitation at birth: chest compression

5 (2.6%)

Resuscitation at birth: epinephrine

1 (0.5%)

Resuscitation at birth: surfactant

14 (7.3%)

Prophylactic indomethacin, ibuprofen, acetaminophen

75 (39.2%)

Patent ductus arteriosus (PDA)

82 (43%)

     Medical treatment only (% of those with PDA)

41 (50%)

     Interventional ligation (% of those with PDA)

13 (16%)

Hydrocortisone for hemodynamic support

27 (14%)

Dexamethasone for BPD treatment

24 (13%)