Serum PCB levels and congener profiles among US construction workers

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

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

*Light is comprised of the sum of congeners 6–74; Heavy is comprised of the sum of congeners 84 to 209
** 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.

ISSN: 1476-069X