Table 3 Respiratory Morbidity and need for respiratory support by gestational age in weeks

n = 151

n = 241

n = 458

n = 850

n = 1149

n = 2444

n = 3343

n = 3729

n = 2261

n = 12926

n = 13776

CRM ^a***

38 (25.2)

38 (15.8)

29 (6.3)

105 (12.4)

32 (2.8)

28 (1.1)

19 (0.6)

28 (0.8)

14 (0.6)

121 (0.9)

226 (1.6)

TTN^***

13 (8.6)

18 (7.5)

18 (3.9)

49 (5.8)

15 (1.3)

17 (0.7)

10 (0.3)

14 (0.4)

8 (0.4)

64 (0.5)

113 (0.8)

RDS^***

17 (11.3)

16 (6.6)

7 (1.5)

40 (4.7)

9 (0.8)

3 (0.1)

2 (0.1)

2 (0.1)

1(0.0)

17 (0.1)

57 (0.4)

Apnea^***

5 (3.3)

2 (0.8)

3 (0.7)

10 (1.2)

3 (0.3)

2 (0.1)

2 (0.1)

2 (0.1)

1 (0.0)

10 (0.1)

20 (0.1)

Air leak^***

5 (3.3)

3 (1.2)

3 (0.7)

11 (1.3)

4 (0.3)

4 (0.2)

4 (0.1)

4 (0.1)

1 (0.0)

17 (0.1)

28 (0.1)

PPH^***

0 (0.0)

1 (0.4)

3 (0.7)

4 (0.5)

1 (0.1)

0 (0.0)

1 (0.0)

2 (0.1)

0 (0.0)

4 (0.0)

8 (0.2)

MAS

0 (0.0)

0 (0.0)

0 (0.0)

0 (0.0)

0 (0.0)

0 (0.0)

1 (0.0)

4 (0.1)

3 (0.1)

8 (0.1)

8 (0.05)

Respiratory failure^**

3 (2.0)

2 (0.8)

0 (0.0)

5 (0.6)

4 (0.3)

6 (0.2)

1 (0.0)

4 (0.1)

1 (0.0)

16 (0.1)

21 (0.15)

Respiratory support^***

33 (21.8)

31 (12.8)

20 (4.3)

84 (9.8%)

23 (2)

15 (0.6)

11 (0.3)

14 (0.4)

10 (0.4)

73 (0.56)

157 (1.14)

Mechanical ventilation^*

7 (4.6)

4 (1.65)

2 (0.43)

13 (1.5)

5 (0.43)

2 (0.08)

2 (0.06)

5 (0.13)

2 (0.08)

16 (0.12)

29 (0.21)

Data are expressed as absolute numbers and proportions (%) of observed data in each category. All tests refer to comparisons between late preterm infants (LPI) and term infants (TI).