If good news outweighs the bad, is it fair to say that on average one need not worry?

In response to studies that demonstrated chronic release of mercury vapor from amalgam fillings during chewing and brushing, the National Institute of Dental and Craniofacial Research (NIDCR) sponsored the Children's Amalgam Trial (CAT). Today's issue of Journal of American Medical Association (JAMA) unveiled the results of CAT, which is summarized by this intriguing quote from the lead author:

"The studies indicate that on average we probably don't have much to worry about..."
(David Bellinger, Harvard Medical School)