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Table 1 Descriptive characteristics of the study cohort.

From: Immune function biomarkers in children exposed to lead and organochlorine compounds: a cross-sectional study

   Total group Subgroup with OC and immune markers
   (N = 671) (n = 331)
   % %
Boys   53.1 56.8
Age 7 years 45.8 46.2
  8 years 50.2 50.2
  9–10 years 4.1 3.6
Passive smoking in the child's home during the last 12 months (cigarettes per day)   
  None 52.2 66.5
  1–10 23.4 24.8
  11–20 14.3 5.3
  more than 30 10.1 2.4
Number of infections during the last 12 months   
  None 6.0 5.7
  1 to < 5 74.7 74.8
  5 to 10 17.2 17.4
  more than 10 2.1 2.1
Duration of total breastfeeding (weeks)   
  0 19.1 15.1
  1 to < 5 7.9 15.4
  5 – 8 12.5 12.1
  9–12 10.6 11.8
  more than 12 34.7 41.1
  Missing 5.2 4.5
Serum cholesterol concentration
(mean, 5–95%-value, mg/dL)    186 (143–235)
Triglyceride concentration    
(mean, 5–95%-value, mg/dL)    130 (53–262)