Document xzNm1K5kN1vE7dqzeDq5GOL1E

i ,%j;V -rr.r-.*... - s-. / 01 .21 " Table 3 presents the year-by-yoar orpertenco ef the cohort tad Indicates the aumbsr of deaths each year from specified causes. In general, a case eras considered to be'prnved" as one of primary cancer of the lung T. / 1 n <u icjCa w r lr/. when the records showed that the diagnosis had boon supported by on autopsy or surgical resection of tho long with microscopic examination of the removed tissue. In one case so considered, however, diagnosis was confirmed by bronchoscopy with visualisation end biopsy. - In another, although there was no aatopey. the diagnosis of primary cancer of the lung seems to have been beyond question. < * i: O ' TABUS S Year-by-Yoor Experience of Cohort and Death Ratos por 100,000 ManYeara of Risk No. Alive Proved At Beginning Primary Tear of Year Ca. of Luna Causa of Death duopocted Primary Other Ca. ofLanq - Causes 1950' 5958 1951 3942 1952 5922 1953 3885 1954 5848 1955 5810 Totals '1 .2 0 2 1 3 9 .: *'2 1 ' 12 o 17 . .0 - 37 - 1 . 34 0 33 0 30 3. MasYears of Unknown Risk 1 5950 1 5932 0 5903.5 0 5860.5 4 5829 0 ST>0.5 T 35271.5 "Proved" rate por 100.000 maa-ycaro of risk e 9 35271..5 25,5 "Total" rats por 100, 000 man-years of risk ^^= 31,0 . 0271