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Table 1 Patient characteristics in the neonatal period and at the time of measurement according to the duration of mechanical ventilation, presented as median and interquartile range (in brackets) or N (%)

From: Effect of intubation and mechanical ventilation on exhaled nitric oxide in preterm infants with and without bronchopulmonary dysplasia measured at a median postmenstrual age of 49 weeks

  Not ventilated infants Intubated and ventilated < 7days Intubated and ventilated ≥ 7days p-value
N = 84 N = 47 N = 45
Neonatal period     
Gestational age (weeks) 29 27 26 <0.001
(28–30) (26 – 28) (25 – 27)
Birth weight (g) 1145 930 803 <0.001
(890–1340) (740–1230) (580 – 950)
Birth weight z-score -0.33 -0.14 -0.44 0.305
(-0.99 - 0.33) (-0.88 - 0.56) (-1.18 - 0.14)
Antenatal steroids1) 59/81 (73%) 33/42 (79%) 41/45 (91%) 0.053
Surfactant administration1) 41/83 (49%) 43/43 (100%) 42/45 (93%) <0.001
BPD 14 (17%) 25 (53%) 35 (78%) <0.001
At day of measurement     
Age (days) 149 142 158 0.105
  (116–204) (116 – 166) (143 – 181)  
Postmenstrual age (weeks) 49.9 48.4 48.3 0.114
(46.9 – 58.0) (44.0 – 51.3) (46.4 – 53.4)
Body length (cm) 57.75 57 56.0 0.155
(55.0 – 62.3) (53 – 60.0) (54–60.0)
Body weight (g) 5052.5 4900 4815 0.210
(4315–6205) (4200 – 5860) (4100 – 5580)
  1. 1)Reduced total number due to incomplete data of patients examined by LFT.
  2. Data represent median and interquartile range (in brackets) or N (%). Statistically significant p-values are printed in bold.