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Table 1 Characteristics of the study population of preterm infants (n = 126).

From: Respiratory symptoms in preterm infants: burden of disease in the first year of life

Characteristics n % a
Bronchopulmonary dysplasia (BPD) 78 62
   mild BPD 28 36
   moderate BPD 36 46
   severe BPD 14 18
Gestational age in weeks (median/range) 28.71 23.9 - 36.1
Male sex 71 56
Birthweight in g (median/range) 1070 420-2980
Chorioamnionitis 42 37
Patent ductus arteriosus 29 23
Prenatal steroids 102 81
surfactant therapy 48 38
Mechanical ventilation 66 52
Days of mech. ventilation (median/range) 1 0-63
CPAP b 113 90
Days on oxygen therapy (median/range) 42 0-385
Days of initial hospital stay (median/range) 70 7-141
Contact to other children c 75 61
Maternal smoking in pregnancy d 13 10
Maternal atopy e 20 16
  1. a Data are given as number (percentage) if not indicated otherwise.
  2. b CPAP = continuous positive airway pressure breathing support
  3. c Contact to other children = having siblings or going to a nursery care institution regularly
  4. d Assessed by parental questionnaire
  5. e Maternal atopy = mother has asthma and/or allergic rhinitis and/or atopic dermatitis