Table 2.
Deaths per 1000 under no intervention (“natural course”) and deaths delayed or prevented by age 80 per 1000 workers for a series of hypothetical occupational exposure limits, 65,999 silica exposed workers across 10 pooled cohorts from the United States, South Africa, Australia, Finland, and China, 1919–1998.
| Deaths delayed or prevented per 1000 workers | Years of life saved (all causes) | |||
|---|---|---|---|---|
|
|
|
|||
| Lung cancer | Other causes | All causes | ||
|
|
||||
| Natural coursea | 0 (ref) | 0 (ref) | 0 (ref) | 0 (ref) |
| 100 ug/m3 | 1.71 (−0.814, 4.24) | 8.77 (2.65, 14.9) | 10.5 (4.40, 16.6) | 3859 (2122, 5598) |
| 50 ug/m3 | 2.47 (0.216, 4.72) | 11.7 (5.58, 17.7) | 14.1 (8.34, 19.9) | 5158 (3409, 6906) |
| 25 ug/m3 | 3.03 (0.927, 5.14) | 13.3 (6.57, 20.0) | 16.3 (9.99, 22.7) | 6337 (4614, 8060) |
| 10 ug/m3 | 3.41 (1.30, 5.52) | 15.2 (9.02, 21.3) | 18.6 (12.6, 24.5) | 7067 (5195, 8940) |
| Eliminate exposure | 3.91 (1.53, 6.30) | 16.8 (10.4, 23.1) | 20.7 (14.5, 26.8) | 7857 (5891, 9823) |
a
Under the natural course, deaths per 1,000 workers by age 80 (95% CI) were 30.3 (29.3, 31.3) for lung cancer and 359 (356, 362) for all other causes.