(22=men, yarn woven median processes, Median fibrosis scores 12=women) but never fibre/mL-year dust control were greater in the carded, spun respectively measures, and asbestos workers than or twisted. job were in the control Fibre counts developed. population for all performed on 39 Estimates levels of exposure former textile used 5,952 significant (p< 0.001) workers and 31 industrial for exposure 7.2-36.5 controls. hygiene samples from Chrysotile median 37.6 1930-1975. & tremolite median 5.0 NB: small Individual asbestos fibre x106 numbers exposure data dry lung p<0.05 Incomplete were not 36.6-109.5 smoking history available for year Chrysotile median available each worker in 30.8 & the cohort; Tremolite median 6.4 estimates of asbestos fibre x106 exposure by dry lung p<0.05 job category at 109.5-370 the plant were year Chrysotile median required. Both 104.5 & the exposure Tremolite median 27.8 zone concept asbestos fibre x106 and the dry lung p<0.05 uniform task Not significant for concept were fibre-years. used to develop Author’s conclusion: exposure Both cumulative models which exposures to asbestos used historic and lung fibre burden plant were strongly production, correlated with severity control, and of asbestosis. Lack of
(22=men, 12=women) Fibre counts performed on 39 former textile workers and 31 controls. NB: small numbers Incomplete smoking history available yarn woven but never carded, spun or twisted. median fibre/mL-year respectively processes, dust control measures, and job were developed. Estimates used 5,952 industrial hygiene samples from 1930-1975. Individual exposure data were not available for each worker in the cohort; estimates of exposure by job category at the plant were required. Both the exposure zone concept and the uniform task concept were used to develop exposure models which used historic plant production, control, and Median fibrosis scores were greater in the asbestos workers than in the control population for all levels of exposure significant (p< 0.001) for exposure 7.2-36.5 Chrysotile median 37.6 & tremolite median 5.0 asbestos fibre x106 dry lung p<0.05 36.6-109.5 Chrysotile median 30.8 & Tremolite median 6.4 asbestos fibre x106 dry lung p<0.05 109.5-370 Chrysotile median 104.5 & Tremolite median 27.8 asbestos fibre x106 dry lung p<0.05 Not significant for fibre-years. Author’s conclusion: Both cumulative exposures to asbestos and lung fibre burden were strongly correlated with severity of asbestosis. Lack of year year
asb_reasons10.12.2015.docx