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CHDS |
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The study's rate of attrition was extremely low; the CHDS observed 89. The CHDS focused on women delivering at primarily one facility of the Kaiser Permanente Medical Center in Oakland, California, whereas the CPP recruited women from 12 medical centers at various locations across the country. The CHDS (van den Berg 1979), a longitudinal study of 20,000 pregnancies among Northern California Kaiser Foundation Health Plan members, enrolled subjects between 1959 and 1966, a time of unrestricted use of PCBs and OCPs. |
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