Table 3
Results of nested case-control analysis, relative risk models
| Model χ2, 1 df | RR* | (95% CI) | |
|---|---|---|---|
| Cases and controls were matched for age, race, sex, date of birth, and study. | |||
| *Rate ratio for increase of one unit of each exposure measure. | |||
| Continuous exposure measures | |||
| Cumulative exposure (mg/m3-y) | 30.9 | 1.04 | (1.03 to 1.06) |
| Average exposure rate over working period (mg/m3) | 19.9 | 2.77 | (1.80 to 4.26) |
| Duration of exposure (y) | 27.2 | 1.04 | (1.02 to 1.06) |
| Log transformed cumulative exposure (log mg/m3-days) | 73.2 | 2.08 | (1.71 to 2.53) |
| Log transformed cumulative exposure (log mg/m 3 -days) | |||
| By study | |||
| 1. US diatomaceous earth workers | 2.08 | (1.23 to 3.52) | |
| 2. Finnish granite workers | 2.76 | (1.37 to 5.57) | |
| 3. US granite workers | 1.76 | (1.30 to 2.38) | |
| 4. US industrial sand workers | 1.63 | (1.03 to 2.57) | |
| 5. US gold miners | 3.57 | (1.90 to 6.69) | |
| 6. Australian gold miners | 2.31 | (1.34 to 3.97) | |
| By age of death (of the cases) | |||
| <65 years | 2.70 | (1.90 to 3.84) | |
| ≥65 years | 1.81 | (1.44 to 2.29) | |
