A survey was done looking at people eating Great Lakes sport fish and their exposure to PCBs. A large percentage of people from the Great Lakes basin eat sport fish on an annual basis. From state to state there is variability - in some states the fish are coming from the Great Lakes, in other states the fish are from much smaller lakes. If you eat the fish, it is likely PCB will bioaccumulate in your tissue. Even if you don't eat fish, your tissue will still have some PCBs.
Males have twice the body burden of PCBs as females.
The background rate for non-sport fish eaters is low for PCBs. But in long time male sport fisherman levels are still almost 5-10 times higher than a comparison population that don't eat sport fish. That is a group exposed by one source to a level of considerable concern, which could perhaps cause effects. So one of the best predictors of PCB values in tissue is the number years an individual has been eating sport fish. While we can argue the PCB levels of concern and the toxicology, the reality is if people aren't getting the word it doesn't matter where we set that level.