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Table 1 Baseline characteristics of the study groups of extremely preterm adolescents (EPT), very preterm adolescents (VPT), and full term-born adolescents answering the questionnaire at both 12–14 and 17–19 years of age

From: Do preterm-born adolescents have a poorer oral health-related quality of life?

  EPT VPT Full term
n = 25 n = 73 n = 93
Sex    
Boys 15 (60%) 33 (46%) 43 (46%)
Girls 10 (40%) 40 (54%) 50 (54%)
Mean age (range) 12.6 (11.2–14.0) 12.7 (11.3–14.2) 12.8 (11.2–14.2)
12–14 years of age    
Mean age (range) 18.2 (16.8–19.3) 18.3 (17.0–19.3) 18.4 (16.8–19.9)
17–19 years of age    
Mean gestational age in weeks (range) 26.6 30.8  ≥ 37
  (24–28) (29–32) No data available
Mean birth weight in grams (range) 893.6 1607.3 3521.0
  615–1250 840–2235 2590–4400
Twins/triplets 2 (8%) 25 (34%) 4 (4%)