Table 1

Characteristics of study groups

Infants with CLD (n = 54) Healthy preterm infants (n = 44) p Value
Birthweight (g)1-150 1055 (510–2310)1420 (840–2150)< 0.01
Gestation (weeks)1-150 28 (24–34)30 (26–34)< 0.01
Sex (M:F)28:2623:211.0
Multiple pregnancy (%)10 (19)20 (45)< 0.01
Antenatal steroids (%)45 (83)31 (70)0.25
Caesarean section (%)32 (59)27 (61)1.0
Apgar score at 5 min1-150 8 (3–10)9 (8–10)< 0.01
Air leak (%)11 (20)
Symptomatic PDA (%)5 (9)
Total duration of ventilation (days)1-150 16 (1–64)
Duration of supplemental oxygen (weeks)1-150 39 (10–103)
  • 1-150 Values expressed as median (range).

  • CLD, chronic lung disease; PDA, patent ductus arteriosus.