Document jBp4zEpJMQ6oRmk1Bo04GBbK2

1 MR. WILLIAMS: Okay. Page 3481 2 (Whereupon, the witness left the witness 3 stand.) 4 (Whereupon, chart displayed to the jury.) 5 BY MR. WILLIAMS: 6 Q Dr. Wong, if you could come and stand right 7 over there towards the VCR. I think that would be a 8 good place. And I see you have already got the 9 pointer. 10 Now, you have testified already that 11 epidemiologists use epidemiologic studies to establish 12 what causes various types of diseases. 13 How do you go about doing that? 14 What is the first thing that you really need 15 to look at in trying to decide what causes the 16 disease? 17 A Well, the first thing we want to do is to 18 compare the risk of people exposed to the chemical or 19 substance to the risk of people not exposed. 20 So we would find out whether there is an 21 increased risk or not, and to do that we have -- I can