Table 3 Demographic and clinical characteristics of infants ≤ 28 6/7 weeks.

Female sex

46.2

52.3

0.65 (0.24-1.77), 0.40

Caucasians race

30.8

31.8

0.96 (0.32-2.89), 0.95

Gestational age^a

25.9 (1.6)

25.9 (1.7)

0.90

Birth Weight^a

817 (246)

789 (113)

0.59

Small for GA status

25.6

18.2

1.27 (0.39-4.14), 0.69

Cesarean delivery

82.1

68.2

2.69 (0.83-8.73), 0.10

Maternal diabetes

7.69

2.27

6.49 (0.47-91.6), 0.16

Maternal chorioamnionitis

23.1

27.3

0.52 (0.16-1.69), 0.28

Maternal steroids

89.7

79.6

3.51 (0.69-17.8), 0.28

Apgar score at 1 min^b

2 (1,5)

3.5 (2,6.5)

0.09

Apgar score at 5 min^b

6 (3,7)

7 (5,8)

0.06

Delivery room oxygen

100

97.7

0.99

Delivery room CPAP

61.5

56.8

2.70 (0.74-9.83), 0.13

DR room positive pressure ventilation

79.5

81.8

0.66 (0.12-3.57) 0.63

Delivery room intubation

66.7

52.3

4.78 (1.02-22.4), 0.04

Surfactant therapy

74.4

77.3

0.57 (0.14-2.24), 0.42

Postnatal steroids

38.5

36.4

0.95 (0.31-2.85), 0.92

Average highest FiO₂^a

0.84 (.25)

0.81 (.27)

0.59

Average lowest FiO₂^a

0.40 (.22)

0.29 (.14)

0.007

Average highest PEEP^a

6.2 (2.3)

5.4 (0.6)

0.09

Average lowest PEEP^a

5.3 (1.6)

5.1 (0.3)

0.50

Average highest PIP^a

19.3 (5.6)

14.5 (4.2)

0.001

Average lowest PIP^a

16 (4.7)

13.3 (4.2)

0.02