Document evRKRyKK1g5e1K8yxL9kggpj9

LUNG CANCER. IN ASBESTOS WORKERS 85 1ABU J MMOERS OF MEN EMPLOYED FOR "DIFFERENT PERIODS BEFORE 1933 AND NUMBERS KNOWN TO tiivt KBmnti* A>0 LONG CANCER IN ASSOCIATION WITH ASBESTOSIS DIVIDED BY SCHEDULED AREA AND BY AGE been employed for 20 to 24 yean in the areas in which they might be exposed to asbestos dust were found to have asbestosis and lung cancer.. s?tks three men had worked for under 10 yean in the pie1933 conditions, three had worked for 10 to 14 years, and three had worked for 15 or more years, the expected number of cases in each of the pre-1933 employment groups would have been tbe same, i.e^ 3 x 3/9, or 1. In fact, the numbers of cases found were 0,1, and 2. The total numbers expected in each pre-1933 employment group are obtained by adding the numbers calculated for each of the age and total employment groups within it- The Faults are as follows: The differences between the numbers of men observed and the numbers expected in each employ ment group, had the incidence of the conditions remained steady throughout, are statistically signi ficant (tout asbestosis, x* = 7-52, n = 2,P = (MJ25; asbestosis and lung cancer, x* =" 8-74, n 2, P * 0-01*). They are highly so if tbe trend, that is. Total rnunbar of man 1 obaarmd ith aabaatnaia rxprifirf Number of meet with').observed Mbtnoiia tab lungj 'tapKKd CtMtf LnfUotEaploymbBUi Jimmy |. IMS Undar 10 Yean 10-14 Yiin IS Yean and Ooar 1) 14 10 III lo-r J0-I 13 *4 7 n * Tba ampactadnumban ofhattcaapar an imail and tba probability inat IN* dilTaranen could trim by chanco baa ccfmqwaUy bwa lomanhai. bw not aarioualy, iindanuitnatad. IT all man with tnora than 10 )nn pn-lUJ amploymam aro troupad lopatbar and Yataa' conacimn mada foe unmil ownban, x* JI2, a I, F a ML