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O05-2 Increased severity of radiologic pneumoconiosis among former us coal miners; federal black lung program data 2001 to 2013
  1. Judith Graber1,2,
  2. Gerald Harris1,
  3. Kirsten Almberg2,
  4. E Lee Petsonk3,
  5. Cecile Rose4,
  6. Robert Cohen2
  1. 1Rutgers The State University of New Jersey, Piscataway, USA
  2. 2University of Illinois – Chicago, Chicago, USA
  3. 3West Virginia University, Morgantown
  4. 4National Jewish Health Colorado School of Public Health, Denver, USA

Abstract

Background In 1970, the US mandated airborne dust exposure limits in mines and established the Federal Black Lung Program (FBLP). Coal miners who apply for FBLP benefits undergo diagnostic testing including chest x-ray and spirometry. We hypothesised that claimants who worked only after 1970 would have lower rates of more advanced coalmine dust lung disease.

Methods We analysed de-identified data from miners’ last FBLP claim filed between 2001 and 2013. Among 24,802 total claims, we assessed the prevalence of: (1) ILO profusion categories (simple coal workers’ pneumoconiosis [CWP] = 1/0 [n = 4,578]; 1/„1–1/2 [n = 3,803]); advanced CWP (2/1–3/+ [n = 1,116]); or progressive massive fibrosis (PMF =A, B, or C [n = 986]); and (2) ATS classification of respiratory impairment (FEV1 percent reference: mild, moderate, and ≤ moderately severe). We assessed predictors of prevalence (age, mining tenure, and geography) using logistic regression, and compared respiratory outcomes among similar-aged miners (49–60 years) who had worked only since the 1970 dust rule (post-1970; n = 3,586) to those who worked before and since 1970 (pre/post-1970; n = 4,434).

Results Among FBLP claimants, 8.5% had advanced CWP or PMF with the highest rates among younger (<56 years: 10.8%) and older (>70 years: 8.3%) miners. 20.6% of claimants had ≤ moderately severe impairment, enough to be considered disabling for mining work (FEV1 < 60% ref). Rates of advanced CWP and PMF were significantly higher among post-1970 compared with pre/post-1970 miners (5.7% vs. 3.8%, p < 0.0001; 7.1% vs. 3.8%, p < 0.0001, respectively), while the percent of miners with disabling impairment was similar between the groups (16.7% vs. 17.6%, p = 0.9190).

Conclusions We found high rates of pulmonary impairment and advanced radiologic pneumoconiosis in former coal miners applying for FBLP benefits. The prevalence of advanced pneumoconiosis was significantly higher in miners who only worked after 1970, suggesting that dust control regulations were ineffective in preventing severe disease.

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