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Table 1 Descriptive table for the NINFEA population under study (N = 141)

From: Birthweight DNA methylation signatures in infant saliva

Characteristics N or mean % or SD
Maternal pre-pregnancy BMIa 22 3.0
Missing values 1
Maternal age at delivery (years) 35 4.1
Maternal education   
 Low/medium (no university degree) 38 27%
 High (university degree or higher) 102 72%
 Missing values 1 1%
Parity   
 First born 45 32%
 Non first born 92 65%
 Missing values 4 3%
Gestational duration (weeks)   
 < 37 weeks 7 5%
 37+ weeks 134 95%
Child sex   
 Female 61 43%
 Male 80 57%
Birthweight (grams) 3242 447.1
 Low (< 2500 g) 5 3.5%
 Medium (2500–4000 g) 128 90.8%
 High (> 4000 g) 8 5.7%
Small-for-gestational-ageb   
 Yes 22 16%
 No 119 84%
Age at saliva sampling (months) 10.78 2.2
  1. aBMI: body mass index (Kg/m2)
  2. bBased on the 10th percentile of the WHO growth reference charts