Document xpybXmr7JBgpY8p6458XbDD0

R&S 000693 DOW CHEMICAL U.S.A. 1603 Building 9 April 1980 midland. Michigan 48640 R. J. Waxweiler, PhD. 6590 Apache Circle Madeira, Ohio 45243 Dear Rick: In followup to our telephone conversation regarding the paper "Vinyl Chloride Exposure in a Controlled Industrial Environment" (Ott et al, Arch. Environ. Health 30:333-338, 1975), there was no calculation of expected number of deaths due to primary CNS malignancies. While Jerry has suggested a couple of alternate methods of obtaining an estimate, it would be imprecise and probably unsuited to your needs in a power calculation. Let me know if you want me to pursue this further. Ralph R. Cook, M.D. cc: M. G. Ott AN OPERATING UNIT OF THE OOW CHEMICAL COMPANY