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. Author manuscript; available in PMC: 2019 May 21.
Published in final edited form as: Ann Am Thorac Soc. 2018 Dec;15(12):1420–1426. doi: 10.1513/AnnalsATS.201804-261OC

Table 2.

Distribution of International Labor Office classifications of large and small opacities for miners with a determination of PMF and an available chest radiograph in the Department of Labor clinical data

 Large Opacity Category* n %
A 915 47
B 548 28
C 158 8
No large opacity 26 1
Missing 283 15
Total: 1,930
 Small Opacity Profusion
 Category† 		n %
0 4 0.2
1 645 40
2 762 47
3 205 13
Missing 5 0.3
Total: 1,621

Definition of abbreviations: ILO = International Labor Office; PMF = progressive massive fibrosis.

*

Categories shown reflect categories of large opacities according to the ILO Classification of Radiographs for Pneumoconiosis.

†

Categories shown reflect major categories of small opacity profusion according to the ILO Classification of Radiographs for Pneumoconiosis. Small opacity profusion categories shown only for radiographs with large opacity categories indicating PMF (category A, B, or C; n = 1,621).