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Table 1 Maternal and child characteristics based on non-imputed data (n = 1346)

From: Associations of circulating folate, vitamin B12 and homocysteine concentrations in early pregnancy and cord blood with epigenetic gestational age: the Generation R Study

Maternal characteristics  
 Age, year 31.4 (4.2)
 Educational level  
  No or primary 26 (2.0)
  Secondary 439 (33.1)
  Higher 826 (65.0)
 Parity  
  Nulliparous 817 (60.7)
  Multiparous 528 (39.3)
 Pre-pregnancy body mass index, kg/m2 22.3 (18.4, 33.7)
 Smoking  
  Non-smoker or smoked until pregnancy was known 1059 (85.7)
  Smoked throughout pregnancy 176 (14.3)
 Gestational age at blood sampling, week 12.8 (9.9, 16.9)
Newborn characteristics  
 Gestational age at birth, week 40.3 (36.7, 42.3)
 DNA methylation gestational age (Bohlin), week 39.4 (37.0, 40.8)
 Raw gestational age acceleration (Bohlin), week − 0.9 (− 2.7, 0.9)
 DNA methylation gestational age (Knight), week 36.3 (32.4, 39.1)
 Raw gestational age acceleration (Knight), week − 3.7 (− 7.4, − 1.1)
 Sex  
  Boy 684 (50.8)
  Girl 662 (49.2)
Birth weight, gram 3546 (510)
  1. Values are mean (SD) or median (95% range) for continuous variables and numbers (%) for categorical variables. Missing data: DNA methylation gestational age and gestational age acceleration estimated by Bohlin’s epigenetic clock (n = 11), highest completed education (n = 19), parity (n = 1), pre-pregnancy BMI (n = 199), smoking (n = 111), gestational age at blood sampling in pregnancy (n = 223), birth weight (n = 1)