Document Y4n7w152qKyg7dmjgXpM64d8

Page 3726 1 Q Isn't it possible that there is also another 2 reason that the fact that it was restricted to 3 volunteers impacts on its general -- ability to be 4 generally interpreted and that is that, and I think 5 this might be what the authors were getting at, that 6 people who might perceive that they might have health 7 problems, might be more likely to come forward and 8 participate in a study than, say, the average worker 9 at the- other end of the scale? 10 A I think that would be particularly true if 11 you had a volunteer study of that sort today. But I 12 think that in 1976, because 1976 happens to be a year 13 when a whole spade of studies appeared, that the 14 average brake worker didn't particularly think his job 15 was anything than really dusty. 16 In fact, the better part of these people 17 were asymptomatic. 18 Q Asymptomatic, that means that -19 A They weren't aware that they had a problem. 20 Q Okay. Nonetheless, the authors of the study 21 thought that was an important enough point to put in