Table 2 Pulmonary function tests’ results in prematurely born young adults and gestational age at birth

FEV₁, %

94.3 ± 14.28

93.00 ± 16.03

94.71 ± 13.89

FEV₁, z-score

-0.39 ± 1.34

-0.60 ± 1.38

-0.32 ± 1.33

FEV₁ < 80%pred.

16.0%

25.0%

13.2%

FEV₁/FVC, %

91.18 ± 11.6

86.08 ± 12.29

92.79 ± 11.06

FEV₁/FVC, z-score

-0.88 ± 1.39

-1.53 ± 1.24

-0.68 ± 1.38

FEV₁/FVC z-score

≤-1.646

28.0%

50.0%

21.1%

MEF 25, %

88.84 ± 37.73

76.17 ± 31.39

92.74 ± 39.00

MEF 25, z-score

-0.53 ± 1.23

-0.93 ± 1.15

-0.41 ± 1.24

MEF 50, %

89.80 ± 29.84

81.75 ± 30.02

92.28 ± 29.73

MEF 50, z-score

-0.54 ± 1.39

-0.92 ± 1.46

-0.43 ± 1.36

MEF 75, %

82.25 ± 21.63

76.75 ± 25.85

83.95 ± 20.24

MEF 75, z-score

-0.83 ± 1.02

-1.10 ± 1.23

-0.75 ± 0.95

PEF, %

82.78 ± 17.77

78.08 ± 23.22

84.23 ± 15.82

PEF z-score

-1.37 ± 1.42

-1.73 ± 1.87

-1.26 ± 1.26

TLC, %

107.40 ± 10.63

106.27 ± 9.50

107.72 ± 11.03

TLC z-score

0.67 ± 0.95

0.59 ± 0.80

0.69 ± 1.00

RV, %

122.22 ± 27.03

116.75 ± 23.74

123.90 ± 28.04

RV z-score

0.86 ± 1.07

0.63 ± 0.88

0.93 ± 1.12

RV/TLC, %

112.98 ± 26.17

109.18 ± 28.18

114.05 ± 25.86

RV/TLC z-score

0.58 ± 1.17

0.40 ± 1.23

0.64 ± 1.16

FRC, %

109.76 ± 17.57

115.83 ± 16.10

107.90 ± 17.78

FRC z-score

0.51 ± 0.95

0.76 ± 0.79

0.44 ± 0.99

LCI 2.5%norm

6.52 ± 0.62

6.90 ± 0.67

6.40 ± 0.56

LCI 2.5%norm ≥6.99

21.2%

50.0%

12.5%

R5Hz

0.35 ± 0.09

0.36 ± 0.08

0.35 ± 0.09

R20Hz

0.32 ± 0.07

0.31 ± 0.07

0.32 ± 0.07

R5-R20

0.04 ± 0.04

0.05 ± 0.05

0.03 ± 0.04

X5

-0.10 ± 0.05

-0.09 ± 0.08

-0.10 ± 0.03

AX

0.33 ± 0.30

0.36 ± 0.21

0.33 ± 0.33

Fres (IOS)

11.86 ± 4.22

12.76 ± 3.40

11.59 ± 4.44

FeNO

19.34 ± 14.93

18.45 ± 11.9

19.59 ± 15.80

FeNO > 25 ppb

24.0%

27.3%

23.1%