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Number of claimants for Federal Black Lung Program benefits and the percentage of these claimants that received a determination of progressive massive fibrosis (PMF) during their claim process, 1970–2016. Observed and Joinpoint regression model results are displayed. Data restricted to those miners with between 5 and 60 years of coal mine employment. Data source: U.S. Department of Labor, Office of Workers’ Compensation Programs, Division of Coal Mine Workers’ Compensation.
