Silicosis in the metal mining industry : a revaluation, 1958-1961.
- United States Public Health Service
- Date:
- [1964]
Licence: Public Domain Mark
Credit: Silicosis in the metal mining industry : a revaluation, 1958-1961. Source: Wellcome Collection.
254/260 page 234
![TABLE A.4.—Comparison of observed values of pulmonary functions for metal mine workers 35 years of age and over who have silicosis with values predicted from metal mine workers without silicosis scene Measurement of pulmonary function Metal mine workers with— PEF FEV; FVC FEV;/FVC Simple silicosis: Predictédsseeee 2c eo 457 Pie fe: 3. 94 68. 0 O)DServed 2 eeenes trae 44] 2. 61 3. 95 ~ 66. 3 Percent reduction__________ 4 4 0 3 Complicated silicosis: Predicted ose. Saaete © Gree 453 2, 67 3. 89 67. 4 ODSernved) 2 et eens arena 382 241 3. 68 6am Percent reduction__________ 16 10 5 6 Using the formulas in table A.5, the predicted value of pulmonary function can be computed using average values for the characteristics of height, age, smoking, years in underground mining, and total years in mining. These formulas were used to compute the predicted value of pulmonary function for groups with no silicosis but having the same average values for these characteristics as the metal mine work- ers with simple silicosis and with complicated silicosis. This was done by substituting in the formulas the average values for the char- acteristics of these groups as shown in table A.2. TABLE A.5.—Formulas relating 4 measurements of pulmonary function to height, age, smoking, underground mining employment, and total mining employment for 7,404 metal mine workers 35 years of age and over with no silicosis Formulas PEF= 271.8+ 5.95X,— 3.83X,— 0.74X;—0.77X, +0.67X; FEV, = —0.432+ 0.0755, — 0.0344 X,— 0.0053 X;—0.0026X, FVC=— 3.90+ 0.139X,— 0.029X,—0.002X; —0.004X; FEV,/FVC= 123.86— 0.499Xi— 0.355X,— 0.092X;— 0.071X,+0.049X, Symbols: X1= Height (inches). X2=Age (years). X3= Amount of smoking (see table A.3). X4= Number of years in underground metal mining. X5= Total number of years in metal mining.](https://iiif.wellcomecollection.org/image/b32183136_0254.jp2/full/800%2C/0/default.jpg)
