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Impairments of Memory and Learning in Older Adults Exposed to Polychlorinated Biphenyls via Consumption of Great Lakes Fish
Environmental Health Perspectives, June, 2001 by Susan L. Schantz, Donna M. Gasior, Elena Polverejan, Robert J. McCaffrey, Anne M. Sweeney, Harold E.B. Humphrey, Joseph C. Gardiner
The current study was restricted to individuals [is greater than or equal to] 49 years of age in 1992 (n = 549). Subjects were randomly selected from 12 cells defined by age (49-59, 60-69, [is greater than or equal to] 70), sex, and fish-eating status, with the goal of recruiting a total of 150-200 people. The details of subject recruitment and the demographic characteristics of participants and refusers have been published previously (12,13). Of those who were contacted, 104 of 158 fish eaters and 84 of 188 non-fish eaters were enrolled in the study (n = 188). Fish eaters who were enrolled had demographic and lifestyle characteristics similar to those of fish eaters who did not enroll, with the exception that fish eaters who participated were more likely to be employed (44% vs. 23%). This difference did not appear to be related to health status, as neither self-ratings of health nor number of hospitalizations within the previous 5 years differed by participant status. Among the non-fish eaters, there were no significant differences between participants and those who did not enroll.
The 188 subjects who agreed to participate were contacted by phone to arrange an in-home visit. A single examiner who was unaware of their exposure history administered a battery of cognitive and motor tests. Table 1 shows the order in which the tests were administered. The findings of the motor function tests have been reported elsewhere (13). All procedures involving human subjects were in accordance with national and institutional guidelines and were approved by the institutional review boards at three cooperating institutions: The University of Illinois at Urbana-Champaign, Michigan State University, and the Michigan Department of Community Health. All subjects provided written informed consent.
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