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Table 1 Characteristics of the study population (Poland, 2014–15, n = 250)

From: Human-Biomonitoring derived exposure and Daily Intakes of Bisphenol A and their associations with neurodevelopmental outcomes among children of the Polish Mother and Child Cohort Study

  N (%)
Sex of the child
 Female 134 (54)
 Male 116 (46)
Child age at examinationa 7.2 ± 0.23
BMI groups
 Underweight 15 (6)
 Recommended weight 192 (77)
 Overweight/Obese 43 (17)
Place of residence at 7 yr
 Urban 216 (86)
 Rural 34 (14)
Urinary cotinine levels at 7 yr
  < 2.1 ng/ml 148 (59)
  > 2.1 ng/ml 101 (41)
Maternal age at delivery
  < 30 years 155 (62)
     > 30 years 95 (38)
Socioeconomic status of the family at 7 yr
 Most affluent (Very good) 50 (20)
 Affluent (Good) 195 (78)
 Least affluent (Poor or very poor) 5 (2)
Maternal educational level at 7 yr
(years of completed education)
  ≤ 9 5 (2)
 10–12 83 (33)
  > 12 162 (65)
Maternal occupational status at 7 yr
 No 28 (11)
 Yes 219 (89)
  1. a Mean ± SD