Characteristics of subjects with silicosis that progressed v those with disease that had not progressed
|
All subjects (n=141) |
Disease progressed (n=52) |
Disease not progressed (n=89) | pValue | ||
| Age at initial chestx ray film (mean (SD)) | 53.7 (8.5) | 51.7 (8.8) | 54.9 (8.2) | p=0.03 | |
| Age at first exposure (mean (SD)) | 27.3 (9.2) | 26.7 (9.0) | 27.7 (9.4) | NS | |
| Duration of exposure (mean (SD)) | 23.4 (9.7) | 23.4 (9.0) | 23.1 (10.1) | NS | |
| Smoking (n (%)): | |||||
| Non-smoker | 23 (16.3) | 10 (19.2) | 13 (14.6) | ||
| Ex-smoker | 44 (32.1) | 19 (36.5) | 25 (28.1) | NS | |
| Current smoker | 74 (52.5) | 23 (44.2) | 51 (57.3) | ||
| Radiological category (initial chest x ray film, n (%)): | |||||
| Simple (category 1) | 76 (53.9) | 24 (46.2) | 52 (58.4) | ||
| Simple (category 2) | 40 (28.4) | 15 (28.9) | 25 (28.1) | NS | |
| Complicated | 25 (17.7) | 13 (25.0) | 12 (13.5) | ||
| Interval between chest xray films (initial and most recent, y) | 7.5 (3.5) | 8.6 (3.8) | 6.9 (3.2) | p=0.004 | |
| Subjects who had ended exposure at least 1 y before the most recent chest x ray film (n (%)) | 123 (87.2) | 44 (84.6) | 79 (88.8) | NS | |
| Time since exposure ended to most recent chest x ray film (y, mean (SD)) | 8.8 (6.5) | 8.2 (5.9) | 9.2 (7.0) | NS | |
| History of tuberculosis | 47 (33.3) | 22 (42.3) | 25 (28.1) | NS | |
t Test was done for continuous variables and χ2 test for categorical variables.