sentences:  The high usage of organotins in both plastics and agricultural maintenance as well as the high affinity of the chemicals further confirms this conclusion.Liver samples from the late 1990s in Europe and Asia contained on average 6 and 84 ng/g wet wt respectively for total organotin levels, while later studies found levels of total organotins in US blood samples averaged around 21 ng/mL with TBT comprising around 8 ng/mL (~ 27 nM).Even more recent analyses of European blood samples found the predominant species to be TPT rather than TBT at 0.09 and 0.67 ng/mL (~0.5-2 nM).