Radiographic abnormalities and asbestos exposure: Libby, Montana

Our plain-English summary of Radiographic abnormalities and asbestos exposure: Libby, Montana, by B. Price (Environmental Health Perspectives, 2004).

The study

• Author: B. Price
• Journal: Environmental Health Perspectives
• Published: 2004;112(2):A82-3, author reply A83
• Type of article: Letter, Comment
• Cited by: 3 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text

In plain English

This is a letter to the editor by one author. It comments on a 2003 study by Peipins et al. of chest X-ray abnormalities among residents of Libby, Montana, who were exposed to asbestos-contaminated vermiculite, and it was printed with the Peipins team's reply. The author wrote that in the ATSDR screening data, 17.8% of 6,668 people with X-ray films had pleural abnormalities. In a reanalysis that the author said was in press elsewhere, pleural abnormalities were recorded for 51% of mine workers, 19.9% of residents with other occupational or domestic exposure, and 9.1% of residents with neither. The author argued that 2-hour air samples from Libby could not meaningfully be compared with OSHA's 8-hour limit. The author concluded that occupational exposure, not low-level environmental exposure, was the most significant risk factor for asbestos-related disease. In reply, Peipins et al. disagreed. They reported that playing in vermiculite piles and longer residence in Libby were associated with pleural abnormalities even after controlling for occupational and domestic exposures. They concluded that both occupational and environmental factors were important predictors.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Letter to the editor commenting on a published study, with a brief reanalysis of that study's data; printed with a reply from the original study's authors
• Who was studied: Residents of Libby, Montana, screened by the Agency for Toxic Substances and Disease Registry (ATSDR); 6,668 subjects had X-ray films
• Exposure: Vermiculite from the Libby mine and amphibole asbestos. People were grouped as mine workers, residents with other occupational or domestic exposure, and residents with environmental exposure only.
• Main results:
  • In the author's reanalysis, pleural abnormalities were recorded for 51% of mine workers, 19.9% of residents with other occupational or domestic exposure, and 9.1% of residents with no occupational or domestic exposure
  • The author compared the overall 17.8% with 6.7% in what the author called the internal control group (no exposure). In reply, Peipins et al. said they had no internal no-exposure group and that this group was a 'no-apparent-exposure' group.
  • Four 2-hour stationary air samples from earlier EPA work, analyzed by two laboratories, gave 0.08 and 0.50, 0.10 and 0.02, 0.03 and none detected, and 0.03 and 0.02 fiber/cm3. The author said comparing these with OSHA's 8-hour limit is not meaningful.
  • The author cited U.S. EPA estimates of lifetime average daily exposure for Libby residents disturbing household dust, vermiculite attic insulation and soil, ranging from 0.00007 to 0.005 fiber/cm3
  • The author cited ATSDR's count of 12 asbestosis deaths: 11 males previously employed at the Libby mine and 1 female household contact of a mine worker
  • In reply, Peipins et al. stated that playing in the vermiculite piles and longer residence in Libby were associated with pleural abnormalities after controlling for occupational and domestic exposures
  • In reply, Peipins et al. stated that the 6.7% rate and the 9.1% rate given by the letter's author were considerably higher than the rates reported in published studies of other nonoccupationally exposed U.S. populations
  • In reply, Peipins et al. noted that one of the three mesothelioma cases identified for their study did not occur among former mine workers
  • The reply's authors concluded that both occupational and environmental risk factors are important predictors of asbestos-related radiographic abnormalities in Libby
• The authors' conclusion: The letter's author concluded that occupational exposure, not low-level environmental exposure, is the most significant risk factor for asbestos-related disease in Libby. The original study's authors disagreed in their reply.

Topics

The National Library of Medicine indexes this study under subjects our site covers: Pleural plaques and thickening, Talc and vermiculite.

Medical terms in this study, explained in our Lexicon: Asbestos Exposure.

Related studies

• Radiographic abnormalities and exposure to asbestos-contaminated vermiculite in the community of Libby, Montana, USA — L.A. Peipins, M. Lewin, et al. (2003)
• Overstating the consequences of radiographic abnormalities — J.J. Flynn, S. Kardos, et al. (2004)
• Potency factors for risk assessment at Libby, Montana — S.H. Moolgavkar, J. Turim, et al. (2010)
• The usefulness of computed tomography in detecting asbestos-related pleural abnormalities in people who had indeterminate chest radiographs: the Libby, MT, experience — O.I. Muravov, W.E. Kaye, et al. (2005)
• Case-fatality study of workers and residents with radiographic asbestos disease in Libby, Montana — A. Miller, C.B. Black, et al. (2022)
• Vermiculite, respiratory disease, and asbestos exposure in Libby, Montana: update of a cohort mortality study — P.A. Sullivan (2007)

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