Table 2.

International Labor Organization Chest Radiography–based Classification of Most Recent Available Chest Radiographs among Miners with Rapidly Progressive Pneumoconiosis and Evaluable Lung Tissue

Miner	Small-Opacity Profusion	Predominant Small-Opacity Shape/Size	Opacity Shape	Large-Opacity Category
1	N/A*	t/t	Irregular	C
2	2/2	r/r	Round	B
3	1/0	s/t	Irregular	C
4	2/3	q/q	Round	C
5	1/2	r/r	Round	B
6	1/1	s/t	Irregular	C
7	2/2	q/r	Round	C
8	3/2	q/r	Round	A
9	1/1	p/p	Round	C
10	2/1	q/q	Round	B
11	2/2	s/t	Irregular	C
12	3/3	s/t	Irregular	A
13	2/3	s/t	Irregular	O

Definition of abbreviation: N/A = not applicable.

N = 13.

^*The only plain image available for this miner was a portable chest radiograph, making it impossible to evaluate profusion. The size and shape of opacities were determined on the basis of that image as well as a computed tomographic scan. The radiograph clearly demonstrated category C progressive massive fibrosis.