Exposure category | Subjects n | Prevalence % | ||
Profusion ≥1/0 | Plaque | DPT and/or CAO | ||
Grace worker | ||||
25–40 yrs of age | 20 | 0 | 20 | 5 |
41–50 yrs of age | 80 | 0 | 26.2 | 5 |
51–60 yrs of age | 63 | 3.2 | 34.9 | 3.2 |
61–90 yrs of age | 81 | 11.1 | 45.7 | 8.6 |
Other vermiculite occupation | ||||
25–40 yrs of age | 122 | 0.8 | 0.8 | 0 |
41–50 yrs of age | 192 | 0.5 | 7.8 | 1 |
51–60 yrs of age | 160 | 0.6 | 13.7 | 0.6 |
61–90 yrs of age | 165 | 0.6 | 24.8 | 8.5 |
Other dusty occupation | ||||
25–40 yrs of age | 237 | 0 | 3.8 | 0.4 |
41–50 yrs of age | 213 | 0 | 2.8 | 0.9 |
51–60 yrs of age | 175 | 0.6 | 12.6 | 0 |
61–90 yrs of age | 183 | 1.1 | 21.9 | 3.3 |
Household | ||||
25–40 yrs of age | 224 | 0 | 2.2 | 0 |
41–50 yrs of age | 234 | 0 | 11.1 | 0.4 |
51–60 yrs of age | 194 | 1 | 20.1 | 1.5 |
61–90 yrs of age | 209 | 2.4 | 38.3 | 5.7 |
Environmental | ||||
25–40 yrs of age | 472 | 0 | 0.4 | 0 |
41–50 yrs of age | 468 | 0 | 1.9 | 0.2 |
51–60 yrs of age | 442 | 0 | 7.7 | 0.9 |
61–90 yrs of age | 463 | 1.3 | 12.7 | 2.2 |
DPT: diffuse pleural thickening; CAO: costophrenic angle obliteration.