Editorials: PDF OnlyZhu Kangmin; Weiss, Noel S.; Stanford, Janet L.; Daling, Janet R.; Stergachis, Andy; McKnight, Barbara; Brawer, Michael K.; Levine, Robert S.Epidemiology: January 1999 - p 83-85 Free Abstract Using data from a case-control study conducted in Group Health Cooperative (GHC) of Puget Sound, we examined the relation between the use of electric blankets or heated water beds and the risk of prostate cancer. Cases were 175 prostate cancer patients ages 40–69 years. Controls were 258 male GHC members frequency matched to cases. The odds ratio (OR) for prostate cancer associated with the use of an electric blanket or heated water bed was 1.4 (95% confidence interval (CI) 0.9–2.2). The risk, however, did not tend to be higher with increasing months per year or years of use. This study did not provide clear evidence on the hypothesized association. (Epidemiology 1999;10:83–85) © 1999 Lippincott Williams & Wilkins, Inc.