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The probability that an event will occur.
attributable r. the rate of a disease or other outcome in exposed individuals that can be attributed to the exposure.
competing r. an event that removes a subject from being at r. for an outcome under investigation.
empiric r. r. that is based on empirical evidence alone, without any appeal to formal theory or surmise.
radiation r.'s The r.'s to health posed by exposure to radiation. Exposure comes from both natural sources and from man-made ones (medical and occupational). See background radiation.Because any amount of radiation may cause cellular mutations, considerable effort has been made by government and independent researchers to establish exposure guidelines. In most cases, natural sources account for the bulk of received radiation, with artificial sources adding only a small percentage to the average annual dose. Public perception of the hazards of radiation is often at odds with scientific positions on the matter. In part, equivocal research results (as in attempts to assess the added cancer risk posed by mammograms) contribute to public fears. Some psychological studies have concluded that whether or not public fears of nuclear power plants and other radiation sources are justified, the added stress caused by such fears in itself constitutes a threat to health that should be addressed.
recurrence r. r. that a disease will occur elsewhere in a pedigree, given that at least one member of the pedigree (the proband) exhibits the disease.
relative r. the ratio of the r. of disease among those exposed to a r. factor, to the r. among those not exposed.
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