Document gaQowDJe4YyqZ8VYmqdowDKwQ

14256997033 2002-02-26 19:09:21 (GMT), page 49 48 level, with an indicator of the work-week adjustment; second, each man's work history was recorded annually from the year in which he started to the year in which he finished, thus reducing the maximum number ofyears from 82 to 59; and thirdly, the format was changed slightly. With these changes; the complete file was reduced in size by over onequarter, but remained enormous (5.9 Megabytes)-"^H Despite these manipulations; foe QAMA-McGill researchers themselves cast doubt on foe reliability offoe exposure estimates for pneumoconiosis and mesothelioma. "Pneumoconiosis death rates per 100,000 subject-years were clearly associated with exposure at foe two main {daces of employment, but the exclusions from this table [early deaths: 12 from pneumoconiosis and 1 from mesothelioma] may have distorted these associations, and certainly make comparison between foe Asbestos mine and mill and Company 3 particularly difficult. There is little sign of corresponding associations with mesothelioma." [Emphasis added] (Liddell et al. 1997b) 48