exposure data statistical power in the to estimate study was largely due exposure by to the small number of job and cases with low and calendar intermediate levels of period. exposure, making it Cumulative not possible to detect lifetime TWA a threshold dose for exposure for the development of each worker asbestosis. Asbestosis was calculated of grade 2 severity or by multiplying more was consistently estimates of found in workers with exposure for lifetime cumulative each job held exposures in excess of by the time 20 fibre/mL-year and spent in each in three cases with job and was exposures ranging expressed as from 10-20 fibre-year. year Authors’ conclusion: histologic asbestosis was usually detectable with exposures of >20 fibre/mL-year and a few cases were found with estimated cumulative exposures of 10-20 fibre/mL-year. McDonald et Cited by: Mortality in a 406 mine Vermiculite Exposure Duration of Cohort mortality Asbestos al (2004) Antao et Cohort of workers (100% mine/mill Concentration: concentration exposure: study reporting exposure al (2012) Vermiculite men) with net M=18 method used: M=9 years deaths in vermiculite producing RMA ID: Miners service of at Standard miners from Libby, 068460 Exposed to Optical Montana respiratory
exposure data to estimate exposure by job and calendar period. Cumulative lifetime TWA exposure for each worker was calculated by multiplying estimates of exposure for each job held by the time spent in each job and was expressed as fibre-year. statistical power in the study was largely due to the small number of cases with low and intermediate levels of exposure, making it not possible to detect a threshold dose for the development of asbestosis. Asbestosis of grade 2 severity or more was consistently found in workers with lifetime cumulative exposures in excess of 20 fibre/mL-year and in three cases with exposures ranging from 10-20 Authors’ conclusion: histologic asbestosis was usually detectable with exposures of >20 fibre/mL-year and a few cases were found with estimated cumulative exposures of 10-20 fibre/mL-year. McDonald et al (2004) Cited by: Antao et al (2012) RMA ID: 068460 Mortality in a Cohort of Vermiculite Miners Exposed to 406 mine workers (100% men) with net service of at Vermiculite mine/mill Exposure Concentration: M=18 concentration method used: Standard Optical Duration of exposure: M=9 years Cohort mortality study reporting deaths in vermiculite miners from Libby, Montana Asbestos exposure producing respiratory year
asb_reasons10.12.2015.docx