Document xjZ6d2oby1XbMpje2d9R1p7LQ

! 4 t /, " w. CLARK COOPER, M.D E150 SHAT'JCK AVE - SUITE 4Q1 BERKElSv CALIFORNIA 94704 p,.4 IS 04=. 335R Julv 20, 1983 WCC 3620 hr. Theo M.L. Scheffers Industrial Hygienist DSM/CVMD P.0. Box 603 6160 MH Geleen The Netherlands Mr Srhpffov'^ This is in reply to your letter of 24 June, 1983 in which you ask for the distribution of the located versus the unlocated members of the VC cohort, based on hire-years. Fortunately, I had a table in my study notes from which I could extract the figures: Number Per cent Year of hi re Total T raced traced Pre-1940 1940-1949 1950-1959 1960-1969 1970-1971 397 2,587 2,918 3,651 620 377 2,407 2,746 3,529 618 94.96 93.04 94.11 96.66 99.68 TOTAL 10,173 9,677 95.11 This confirms your deduction that there was slightly less effective followup of the early hires. The difference was relatively small, however. You understand, of course, that the person-years contributed by a non-traced individual did not stop until the date he was last known to be alive. This was usually the termination date of his employment. Unfortunately, I can not furnish these dates easily. I hope the foregoing proves useful to you in your review. Sincerely, r &S 002912 WCC:bs cc: Mr. Torkelson