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Table 1 Neonatal and current clinical characteristics of the 35 children born extremely preterm

From: Health related quality of life after extremely preterm birth: a matched controlled cohort study

Number of boys, n (%) 13 (37)
Gestational age (weeks)a) 26.7 (1.7)
Birth weight (grams)a) 933 (204)
Impaired hearing, n (%) 2 (5.7)
Epilepsy, n (%) 3 (8.6)
ADHD b), n (%) 2 (5.7)
Mild mental retardation, n (%) 5 (14.3)
Intraventricular hemorrhage grade 1-2, n (%) 8 (22.9)
Maternal infection, n (%) 11 (31.4)
Prenatal steroid treatment, n (%) 15 (42.9)
Neonatal steroid treatment, n (%) 10 (28.6)
Days on ventilator a) 8.3 (11.8)
Oxygen treatment (days)a) 57.4 (48.0)
   Boys * 81.7 (59.9)
   Girls * 43.0 (33.1)
Bronchopulmonal dysplasia  
-none; n (%) 9 (25.7)
-mild c); n (%) 14 (40.0)
-moderate/severe d); n (%) 12 (34.3)
Age when assessed (years) a) 10.5 (0.4)
  1. a) Mean (standard deviation)
  2. b) Attention Deficit Hyperactivity Disorder
  3. c) Requirement for oxygen treatment at age 28 postnatal days
  4. d) Requirement for oxygen treatment at 36 weeks postmenstrual age
  5. * Boys vs. girls p-value = 0.047 (independent sample t-test)