Do the data suggest that people actually could have had contact with the contaminant?
Exposure is contact with a contaminant. Without exposure there can be no health effect, regardless of the level of contamination found in the environment. In every case, researchers used data about levels of contaminants to estimate exposure. • Did the data represent a time period that could have been related to breast cancer incidence between 1993 and 1997? Scientists estimate that breast cancer could occur somewhere between 5 and 40 years after a person is exposed to risk factors that might have caused the disease. This time period is referred to as the “latency period.” This varies depending on what may have started the breast cancer and the age of a woman when she was exposed. For the most part, even the oldest environmental data sets evaluated did not include data prior to the 1970s. Because of data limitations and cancer latency, environmental data that pre-dated the cancer incidence data were given a higher rating for purposes of characterizing exposure. • Did a better data set
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