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Coal Worker Pneumoconiosis (CWP) Category 1+ Prevalence for Miners With ≥ 20 Years Tenure: United States, 2005–2009
| CWP Prevalence (%) |
|||
| Overall | Without Enhanced Program Data | Enhanced Program Alone | |
| High-rank | 13.3 | 17.6 | 11.5 |
| Northern Appalachia | 2.6 | 4.1 | 1.8 |
| Southern Appalachia | 14.2 | 25.0 | 11.4 |
| Midwest | 1.9 | 1.9 | 2.0 |
| West | 2.9 | 4.8 | 1.5 |
