Document aBxq4y2D0pq9OOvVxXjqMGLRe

213. . I-1. 1 .V 1 \*u* f/ mffi p!&&Y Cfl l *V* II* Iff ' Bn It /; did. we study? The sort of groups that have been used for epidemiological work have been the following: Miners attending hospital* I'm ashamed almost to put that on a slide, but I wouldn't do it except that quite prominent papers have been'published on miners attending hospital. -- and clearly they are -- even a highly selected group,' even if the doctor himself.doesn't select his patients -- they have been selected for him on a very curious and unpre- die table basis* A lot of papers have been published on applicants or receipts, for compensation* All the figures I have shown you so far as we have gone, are based on that sort of popu- lati-on, but again many-fold motives effect a man's application for compensation, and it's difficult to use that type of population for active work* You then have more carefully selected populations The ideal population would be all the men who have ever worked in an industry,, whatever they're now doing, but * clearly, that's impossible. What we can do is take select- * ed cases, all the cases in a mine and selected occupations. * all the underground workers, all the underground workers and surface worker's., because miners tend to go from under- ground to surface from time to time, or complete mining communities* We have adopted, at various times, the pop- ulations three to six* ' | 1 1 SEVENTH SARANAC -0248