Table 1  Contaminant concentrations in plasma (μg/kg lipid-based).
Quartile boundaries
Contaminant  Percent detected  Geometric mean (95% CI)  Range  1st  2nd  3rd  4th
Maternal plasma (n = 199)
 ∑ PCBs  NA  308 (279–340)  59.6–1,951  < 190  190–296  296–500  > 500
 PCB-153  100  102 (91.4–113)  14.6–709  < 57.6  57.6–98.4  98.4–170  > 170
 DDE  100  294 (267–324)  54.3–2,269  < 183  183–281  281–472  > 472
Infant plasma (n = 172)
 ∑PCBs  NA  259 (218–307)  26.9–3,801  < 99.0  99.0 –283  283–609  > 609
 PCB-153  96.5  76.1 (62.4–92.9)  ND–1,441  < 28.0  28.0–95.3  95.3–199  > 199
 DDE  100  256 ( 214–307)  15.6–4,386  < 100  100–355  355–618  > 618
Abbreviations: CI, confidence interval; NA, not applicable; ND, not detected.