Discuss the factors that limit the usefulness of epidemiological studies in estimating the harmful effects of chemicals.
What will be an ideal response?
There are four main factors that limit the utility of epidemiological studies in estimating the harmful effects of chemicals. Often, such studies involve too few people who have subject to high doses of potentially chemicals to draw statistically significant conclusions. In other words, it may be very difficult to draw broad conclusions from the data in the studies. Also, these studies take a very long time to conduct. Decisions may need to be made before the study is complete. Additionally, in people experience many different potential toxins in their daily lives. Scientifically isolating the effect of a single toxin may be difficult, if not impossible. Last, these studies examine harm that has already been done; they cannot be used to predict the effects of new chemicals before they go into use.
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