Biomedical Bestiary: An Epidemiologic Guide to Flaws and by Max Michael III, W. Thomas Boyce, Allen J. Wilcox PDF

By Max Michael III, W. Thomas Boyce, Allen J. Wilcox

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Extra resources for Biomedical Bestiary: An Epidemiologic Guide to Flaws and Fallacies in the Medical Literature

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Glin. Pharmacol. Ther. 26:129, 1979. A general review ojseveral types ofbias including response bias. Hayden, G. , Kramer, M. , and Horwitz, R. I. The case-control study. ]AMA. 247:326, 1982. Examples ofstudies affected by different types oj bias are given. Among the studies cited where response bias may have affected the results are the observed associations between endometrial cancer and estrogens, and between measles and the risk oj subacute sclerosing panencephalitis. , Andereck, N. , and Tyler, C.

04 34 Table 2. 0% (321400) The Beasts 35 winter, especially iflabor was rapid. On the other hand, women with prolonged or complicated labor would make every attempt to reach the hospital regardless ofthe season. Dr. Kahn went back to the clinic files to find the records of women who had delivered at home. In fact, home deliveries were much more common in winter. Furthermore, the rate of labor complications among home deliveries was very low. This reflected the selective tendency of women with normal labors to stay home.

And Jablon, S. Effects of selection on mortality. ]. Epidemiol. 100:376, 1974. The authors demonstrate that, as a result afthe screenirg process b)' which they are chosen, United States Ann)' inductees are a very nonrepresentative group of persons. Since only the health)' are inducted, their risk of disease both while in the ann)' and after discharge is less than that for the general population. This effect Urgers for ),ears after discharge. As a result, an)' stud)' of ann)' veterans that compares their health status to the general population's health status must reckon with the selection bias involved.

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