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Table 1 Description of the study population

From: Maternal concentration of polychlorinated biphenyls and dichlorodiphenyl dichlorethylene and birth weight in Michigan fish eaters: a cohort study

Characteristic   n = 168 %
Gender Male 80 47.6
  Female 88 52.4
Maternal DDE (μg / L) < 5 46 27.4
  5 -< 15 89 53.0
  15 -< 25 25 14.9
  ≥25 8 4.7
Maternal PCB (μg / L) < 5 84 50.0
  5 -< 15 66 39.3
  15 -< 25 11 6.5
  ≥25 7 4.2
Parity 0 57 33.9
  1 65 38.7
  2 31 18.5
  ≥3 15 8.9
Gestational age (weeks) < 37 5 3.0
  37 -< 40 23 13.7
  ≥40 140 83.3
Maternal age (years) 15 – 24 41 24.4
  25 – 29 70 41.7
  30 and older 57 33.9
Maternal height (cm) <155 14 8.3
  155 -< 170 122 72.6
  ≥170 32 19.1
Maternal education High school 71 42.3
  College 44 26.2
  College plus 53 31.5
Maternal smoking status during pregnancy Yes 22 13.1
  No 146 86.9
Child birth year 1968 – 1972 48 28.6
  1973 – 1982 98 58.3
  >1983 22 13.1