Table 2 Demographic and clinical characteristics of infants 29 0/7 – 34 6/7 weeks.

Female sex

34.6

44.7

0.91 (0.36-2.30), 0.85

Caucasians race

65.4

50.0

2.30 (0.93-5.70), 0.07

Gestational age^a

32.1 (1.8)

32.6 (1.7)

0.14

Birth weight^a

1820 (427)

1921 (471)

0.20

Small for GA status

30.8

13.8

3.81 (1.30-11.2), 0.02

Cesarean delivery

71.2

69.2

0.66 (0.24-1.84), 0.43

Maternal diabetes

30.1

17.0

3.01 (1.06-8.59), 0.04

Maternal chorioamnionitis

9.62

7.45

1.43 (0.28-7.35), 0.67

Maternal steroids

67.3

77.7

0.32 (0.11-0.98), 0.04

Apgar score at 1 min^b

7 (5,8)

7 (5,8)

0.97

Apgar score at 5 min^b

8 (7,9)

8 (7,9)

0.35

Delivery room oxygen

98.1

65.9

35.0 (3.00-409), 0.005

Delivery room CPAP

86.5

69.2

0.85 (0.15-4.73), 0.85

DR room positive pressure ventilation

34.6

29.8

0.29 (0.09-0.89), 0.03

Delivery room intubation

7.69

4.26

0.58 (0.06-5.76), 0.64

Surfactant therapy

44.2

11.7

6.43 (2.16-19.1) 0.001

Average highest FiO2^a

0.54 (30)

0.55 (31)

0.87

Average lowest FiO2^a

0.31 (.18)

0.25 (.06)

0.02

Average highest PEEP^a

5.7 (0.9)

5.1 (0.4)

0.01

Average lowest PEEP^a

5.2 (0.7)

5.0 (0.0)

0.13

Average highest PIP^a

19.8 (4.7)

13.4 (3.2)

0.003

Average lowest PIP^a

18.5 (4.9)

12.9 (3.2)

0.01