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Table 1 Descriptive statistics for the discovery and replication samples

From: Epigenetic signature of preterm birth in adult twins

Variables Discovery Replication
Age, year
 Median 33 66
 Range 30–36 56–80
Gestational age, week
 Median 39 0 (weeks before term)
 Range 33–42 0–8 (weeks before term)
 Report method DMBR Midwife
Sample size
 Male 78 192
 Female 66 158
Total 144 350
PTB 26 40 (more than 3 weeks before term)
  1. DMBR Danish Medical Birth Registry