Characteristics of workers (n=239) with completed secondary evaluation
| Simple silicosis (n=65) | Complicated silicosis (n=21) | No current silicosis diagnosis (n=153) | ||
| Sex | N | 65 | 21 | 153 |
| Male, N (%) | 65 (100.0) | 21 (100.0) | 145 (94.8) | |
| Age (years) | N | 65 | 21 | 153 |
| Mean (SD) | 42.0 (9.1) | 41.4 (11.5) | 40.3 (11.3) | |
| Ethnicity | N | 60 | 17 | 141 |
| Caucasian, N (%) | 21 (35.0) | <5 | 51 (36.2) | |
| South East Asian, N (%) | 9 (15.0) | <5 | 16 (11.3) | |
| Other/unspecified, N (%) | 30 (50.0) | 12 (70.6) | 74 (52.5) | |
| Region of birth | N | 41 | 15 | 105 |
| Australia | 14 (34.1) | 7 (46.7) | 42 (40.0) | |
| Asia | 19 (46.3) | 7 (46.7) | 38 (36.2) | |
| Europe | 5 (12.2) | 0 (0.0) | 19 (18.1) | |
| Other | <5 | <5 | 6 (5.7) | |
| Duration of work in industry (years) | N | 65 | 21 | 153 |
| <10, N (%) | 15 (23.1) | 7 (33.3) | 76 (49.7) | |
| 10–20, N (%) | 36 (55.4) | 9 (42.9) | 56 (36.6) | |
| >20, N (%) | 14 (21.5) | 5 (23.8) | 21 (13.7) | |
| Proportion time dry stone processing | N | 65 | 21 | 153 |
| Never | 0 (0.0) | 0 (0.0) | 7 (4.6) | |
| ≤50%, N (%) | 18 (27.7) | 7 (33.3) | 94 (61.4) | |
| >50%, N (%) | 47 (72.3) | 14 (66.7) | 52 (34.0) | |
| Smoking history | N | 65 | 21 | 153 |
| Never, N (%) | 20 (30.8) | 8 (38.1) | 64 (41.8) | |
| Past, N (%) | 23 (35.4) | 5 (23.8) | 46 (30.1) | |
| Current, N (%) | 22 (33.8) | 8 (38.1) | 43 (28.1) | |
| Investigations | ||||
| FEV1 | N | 60 | 17 | 141 |
| % pred | Mean (SD) | 97.4 (15.5) | 87.2 (17.9) | 101.2 (15.5) |
| FVC | N | 60 | 17 | 141 |
| % pred | Mean (SD) | 99.8 (13.6) | 93.8 (16.0) | 103.9 (13.6) |
| DLCO | N | 60 | 16 | 141 |
| % pred | Mean (SD) | 96.2 (18.0) | 90.1 (17.4) | 102.6 (18.7) |
| Chest X-ray ILO | N | 64 | 18 | 149 |
| 0, N (%) | 23 (35.9) | 0 (0.0) | 108 (72.5) | |
| 1–3, N (%) | 41 (64.1) | 18 (100.0) | 41 (27.5) | |
| ANA | N | 50 | 17 | 120 |
| Not detected, N (%) | 33 (66.0) | 9 (52.9) | 91 (75.8) | |
| Detected, N (%) | 17 (34.0) | 8 (47.1) | 29 (24.2) | |
| ACE level | N | 46 | 18 | 116 |
| Normal, N (%) | 30 (65.2) | 8 (44.4) | 104 (89.7) | |
| Abnormal, N (%) | 16 (34.8) | 10 (55.6) | 12 (10.3) | |
Results from the remainder of the blood test panel were not presented.
ACE: abnormal >70 U/L.
*Cell sizes of less than five are not reported.
ANA, antinuclear antibodies (detectable titre ≥1:80); DLCO, diffusion capacity of the lung for carbon monoxide; FEV1, prebronchodilator forced expiratory volume in 1 second; FVC, prebronchodilator forced vital capacity.