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Table 3 Light and heavy congener serum concentrations and % contributions to total PCB

From: Serum PCB levels and congener profiles among US construction workers

PCBs subject 1 subject 2 subject 3 subject 4 subject 5 subject 6 subject mean ref** mean subject median ref Median
Serum concentration (ng/g)
Light * 0.201 0.191 0.261 0.151 0.195 0.378 0.230 0.094 0.196 0.064
Heavy 1.66 1.91 0.788 1.36 1.57 8.33 2.61 1.19 1.80 0.949
Percent contribution
Light 10.8 9.08 24.9 10.0 11.0 4.34 11.7 6.54 9.82 6.320
Heavy 89.2 90.9 75.1 90.0 89.0 95.7 88.4 91.7 90.17 93.68
  1. *Light is comprised of the sum of congeners 6–74; Heavy is comprised of the sum of congeners 84 to 209
  2. ** Reference PCB values are means for 5-year age groups from 358 men in the Greater Boston area. Referent subjects range from 18–51 years old.