Format

Send to

Choose Destination
See comment in PubMed Commons below
J Occup Environ Med. 2012 Nov;54(11):1350-8. doi: 10.1097/JOM.0b013e31824fe174.

Exposure estimates for workers in a facility expanding Libby vermiculite: updated values and comparison with original 1980 values.

Author information

1
Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA.

Abstract

OBJECTIVE:

Low cumulative fiber exposure (CFE) has been associated with health effects in a cohort exposed to Libby vermiculite. This study refines the original 1980 exposure estimates and compares the CFE results.

METHODS:

Cumulative fiber exposure estimates were developed using three times more industrial hygiene measurements and long-term workers' input. New adjustments included vermiculite ore source, seasonal overtime hours, time spent in various tasks, and recollection of historical dustiness.

RESULTS:

The overall mean (95% confidence interval) CFE (n = 513) in 1980 (0.80 [0.69 to 0.93]) was statistically similar to the overall mean (95% confidence interval) CFE in 2010 (0.74 [0.61 to 0.90]). The mean CFE in the lowest exposure category (<2 fiber-years/cm) decreased from 0.36 to 0.22 fiber-years/cm (P < 0.05). The 2010 CFE estimate extended the upper bound of the range of previous estimates from 28.10 to 106.31 fiber-years/cm.

CONCLUSIONS:

The range of CFE values was expanded. These estimates may impact the understanding of Libby vermiculite health outcomes.

PMID:
22544162
DOI:
10.1097/JOM.0b013e31824fe174
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Lippincott Williams & Wilkins
    Loading ...
    Support Center