Cumulative Retrospective Exposure Assessment (REA) as a predictor of amphibole asbestos lung burden: validation procedures and results for industrial hygiene and pathology estimates.

Other typically non-commercial (North America) asbestos fiber types such as tremolite, actinolite and anthophyllite often remained in the lungs of the cases associated with FT Classes 3 and 4, but apparently these asbestos fibers were not proportionally related to the primary asbestos exposures associated with the cases, based on the ANCOVA results represented in Figure 5 . In Figure 5 , the difference in slopes for FT Classes 1 and 2 were significant with a one-sided t -test, but were marginally significant with a two-sided test ( p = 0.0545).

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