Table 2 Demographic characteristics of infants at age 6, 12, 18, and 24 months stratified by severity of bronchopulmonary dysplasia (BPD).

No. of children (n)

39

38

15

Body weight, kg

7.54 ± 0.91

7.63 ± 0.82

7.27 ± 1.57

Body weight, z-score

−0.27 ± 1.05

−0.13 ± 0.80

−0.94 ± 1.30

Body length, cm

66.9 ± 3.3

67.1 ± 2.7

66.2 ± 3.4

Body length, z-score

−0.0.07 ± 1.18

−0.09 ± 0.99

−0.97 ± 1.00*^#

Tidal breathing analysis (n)

39

38

15

Respiratory mechanics (n)

37

31

14

Tidal forced expiration (n)

32

32

14

Raised-volume forced expiration (n)

10

15

10

No. of children

37

22

16

Body weight, kg

9.49 ± 0.98

8.90 ± 1.33

8.85 ± 1.32

Body weight, z-score

−0.05 ± 0.90

−0.53 ± 1.16

−0.77 ± 1.06*

Body length, cm

76.6 ± 2.8

74.6 ± 3.5**

74.8 ± 3.5*

Body length, z-score

0.26 ± 1.09

−0.36 ± 1.05*

−0.51 ± 0.86*

Tidal breathing analysis (n)

37

22

16

Respiratory mechanics (n)

30

21

14

Tidal forced expiration (n)

33

22

15

Raised-volume forced expiration (n)

10

10

10

No. of children

30

14

14

Body weight, kg

10.84 ± 1.13

9.83 ± 1.63*

10.41 ± 1.37

Body weight, z-score

−0.03 ± 0.82

−0.72 ± 1.09*

−0.63 ± 1.02*

Body length, cm

82.0 ± 2.8

79.3 ± 4.7*

81.1 ± 3.3

Body length, z-score

−0.19 ± 0.86

−0.87 ± 1.11*

−0.86 ± 0.91*

Tidal breathing analysis (n)

30

14

14

Respiratory mechanics (n)

24

14

14

Tidal forced expiration (n)

29

14

12

Raised-volume forced expiration (n)

12

10

12

No. of children

16

11

10

Body weight, kg

12.35 ± 1.63

11.95 ± 1.67

11.18 ± 2.31

Body weight, z-score

−0.01 ± 0.93

−0.36 ± 1.02

−0.85 ± 1.83

Body length, cm

88.4 ± 3.6

83.9 ± 4.3*

85.3 ± 4.7

Body length, z-score

0.04 ± 1.04

−1.50 ± 1.22**

−0.71 ± 1.48*

Tidal breathing analysis (n)

16

11

10

Respiratory mechanics (n)

14

10

10

Tidal forced expiration (n)

14

10

10

Raised-volume forced expiration (n)

10

8

8