Table 1 General clinical characteristics of infants with successful and failed extubation

Gestational age/weeks

29.0(27.3 ~ 30.5)

27.6(26.2 ~ 29.4)

0.044^a

Birth weight (g)

1135(900 ~ 1380)

1010(817 ~ 1215)

0.079^a

Gender (M/F)

65/36

12/6

0.850^b

Mode of delivery (VD/CS)

27/74

6/12

0.771^b

Antenatal steroids (Yes/No)

78/23

13/5

0.873^b

Apgar score(at 1 min)

8(6 ~ 10)

7(5 ~ 9)

0.225^a

Apgar score(at 5 min)

9(8 ~ 10)

9(8 ~ 10)

0.205^a

Pulmonary surfactant (Yes/No)

54/47

5/13

0.037^b

Steroids used for infants (Yes/No)

6/95

4/14

0.067^b

Caffeine use (Yes/No)

82/19

15/3

1^b

Inotropes use (Yes/No)

9/92

2/16

1^b

Postmenstrual gestational age at extubation/weeks

29.7(28.2 ~ 30.9)

29.5(28.2 ~ 30.7)

0.689^a

PEEP before extubation /cmH2O

5(5 ~ 6)

6(5 ~ 6)

0.017^a

PIP before extubation /cmH2O

15.5(15 ~ 17)

18(17 ~ 18.5)

0.001^a

FiO2 before extubation /%

24.5(21 ~ 27)

26(25 ~ 35)

0.004^a

Duration of mechanical ventilation /d

3(1 ~ 5)

6.5(2.8 ~ 19.8)

0.010^a

Post-extubation support^c

Room air

17

1

-

NIPPV

32

11

-

nCPAP

23

4

-

BiPAP

19

2

-

O2

10

0

-