The “Middling” Tendency

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Abstract
The UICC/ILO Classification of pneumoconiosis divides each of the three major categories of simple pneumoconiosis into three subcategories. Although it is often assumed that the relative widths of the central and marginal subcategories, eg, 1/0, 1/1, and 1/2, that compose a major category are equal, the original describes of the elaboration did not subscribe to this view. It is well known that the percentage of subjects with the major categories of simple pneumoconiosis decreases with increasing category. Similarly it might be inferred that the percentage of subjects with each subcategory would decline as one proceeds up the scale from 0/0 to 3/4. In practice this phenomenon is not seen and more subjects are placed in the middle subcategories.

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