Figure 2
From: Serum PCB levels and congener profiles among teachers in PCB-containing schools: a pilot study
Comparison of median serum congener concentrations normalized to congener 153 concentration between teachers and MGH referents. Comparison of the height of the two bars (teachers and referents) for each congener illustrates the differences in the relative abundance of each congener in the serum of the teachers and the referents. The greatest differences are apparent in the lighter congeners, PCB 6-74, where the teachers' values consistently exceed the referents.