opacities, (SD=6.46) Due to new Pleural changes profusion of fibre/mL-year environmental directly related to 2.9%) controls, there cumulative fibre ≥1/0; All 8 with was a exposure, greatest interstitial decrease in prevalence (54.3%) in changes NB. Small fibre exposure the highest exposure occurred at numbers of after 1973. quartile the 72% or workers with Therefore, fibre/mL-year) of greater interstitial each workers maximum changes (n=8) department cumulative Pleural changes can was assigned fibre exposure occur at low lifetime two values, Smoking history range, 6 cumulative fibre fibre available occurring at exposure levels as exposures the 90% or demonstrated by the through 1973 greater range. 12% prevalence within and exposures participants and living after 1973. non participants with Individuals <1.92 fibre/ mL-years were assigned cumulative fibre a cumulative exposure, and 20% fibre exposure prevalence within value, which participants with <2.21 was the fibre/mL-year summation of cumulative exposure estimated fibre 2.9% of participants exposure by had interstitial changes department, and were significantly based on the related to cumulative years exposure mean employed exposure of 11.37 between 1963 fibre/mL-year and 1980. Author’s conclusion: exposures to asbestos users of Libby
opacities, profusion of ≥1/0; 2.9%) NB. Small numbers of workers with interstitial changes (n=8) Smoking history available (SD=6.46) fibre/mL-year All 8 with interstitial changes occurred at the 72% or greater maximum cumulative fibre exposure range, 6 occurring at the 90% or greater range. Due to new environmental controls, there was a decrease in fibre exposure after 1973. Therefore, each department was assigned two values, fibre exposures through 1973 and exposures after 1973. Individuals were assigned a cumulative fibre exposure value, which was the summation of estimated fibre exposure by department, based on the years employed between 1963 and 1980. Pleural changes directly related to cumulative fibre exposure, greatest prevalence (54.3%) in the highest exposure quartile fibre/mL-year) of workers Pleural changes can occur at low lifetime cumulative fibre exposure levels as demonstrated by the 12% prevalence within participants and living non participants with <1.92 fibre/ mL-years cumulative fibre exposure, and 20% prevalence within participants with <2.21 fibre/mL-year cumulative exposure 2.9% of participants had interstitial changes and were significantly related to cumulative exposure mean exposure of 11.37 fibre/mL-year Author’s conclusion: exposures to asbestos users of Libby
asb_reasons10.12.2015.docx