The mechanical properties of the lungs were studied in two groups of coal miners. The first group consisted of miners with either simple or no pneumoconiosis and was divided into two subgroups (1A and 1B). The former (1A) consisted of 62 miners most of whom had simple pneumoconiosis but a few of whom had clear films. Although their spirometry was normal, all claimed to have respiratory symptoms. The other subgroup (1B) consisted of 25 working miners with definite radiographic evidence of simple pneumoconiosis but normal spirometric findings. The second major group consisted of 25 men with complicated pneumoconiosis.
Anthony Seaton, N. LeRoy Lapp, Wm. Keith C. Morgan
Usage data is cumulative from July 2023 through July 2024.
Usage | JCI | PMC |
---|---|---|
Text version | 73 | 0 |
33 | 22 | |
Figure | 0 | 1 |
Scanned page | 74 | 10 |
Citation downloads | 8 | 0 |
Totals | 188 | 33 |
Total Views | 221 |
Usage information is collected from two different sources: this site (JCI) and Pubmed Central (PMC). JCI information (compiled daily) shows human readership based on methods we employ to screen out robotic usage. PMC information (aggregated monthly) is also similarly screened of robotic usage.
Various methods are used to distinguish robotic usage. For example, Google automatically scans articles to add to its search index and identifies itself as robotic; other services might not clearly identify themselves as robotic, or they are new or unknown as robotic. Because this activity can be misinterpreted as human readership, data may be re-processed periodically to reflect an improved understanding of robotic activity. Because of these factors, readers should consider usage information illustrative but subject to change.