Conditional Logistic Regression Analysis of Risk of Multiple Myeloma and Exposure to Total Hydrocarbons in a Nested Case-Control Study of Gasoline Distribution Workers
| Model . | Variables in Model . | β . | SE (β) . | χ2 . | P . | RR4-150 . |
|---|---|---|---|---|---|---|
| 1 | Length of exposure (yrs) | −0.038778 | 0.034580 | 1.257 | .262 | 0.96 |
| 2 | Cumulative exposure (ppm-years) | −0.000536 | 0.000732 | 0.536 | .464 | 1.00 |
| 3 | Cumulative frequency of peak exposure | 0.000046 | 0.000052 | 0.790 | .374 | 1.00 |
| 4 | Length of exposure (yrs) | −0.033747 | 0.038630 | 0.763 | .382 | 0.97 |
| Cumulative exposure (ppm-years) | −0.000218 | 0.000755 | 0.083 | .773 | 1.00 | |
| 5 | Length of exposure (yrs) | −0.098083 | 0.052870 | 3.441 | .064 | 0.91 |
| Cumulative frequency of peak exposure | 0.000153 | 0.000089 | 2.980 | .084 | 1.00 | |
| 6 | Cumulative exposure (ppm-years) | −0.001228 | 0.001040 | 1.381 | .240 | 1.00 |
| Cumulative frequency of peak exposure | 0.000088 | 0.000065 | 1.850 | .174 | 1.00 |
| Model . | Variables in Model . | β . | SE (β) . | χ2 . | P . | RR4-150 . |
|---|---|---|---|---|---|---|
| 1 | Length of exposure (yrs) | −0.038778 | 0.034580 | 1.257 | .262 | 0.96 |
| 2 | Cumulative exposure (ppm-years) | −0.000536 | 0.000732 | 0.536 | .464 | 1.00 |
| 3 | Cumulative frequency of peak exposure | 0.000046 | 0.000052 | 0.790 | .374 | 1.00 |
| 4 | Length of exposure (yrs) | −0.033747 | 0.038630 | 0.763 | .382 | 0.97 |
| Cumulative exposure (ppm-years) | −0.000218 | 0.000755 | 0.083 | .773 | 1.00 | |
| 5 | Length of exposure (yrs) | −0.098083 | 0.052870 | 3.441 | .064 | 0.91 |
| Cumulative frequency of peak exposure | 0.000153 | 0.000089 | 2.980 | .084 | 1.00 | |
| 6 | Cumulative exposure (ppm-years) | −0.001228 | 0.001040 | 1.381 | .240 | 1.00 |
| Cumulative frequency of peak exposure | 0.000088 | 0.000065 | 1.850 | .174 | 1.00 |
Data from Wong et al.69
Relative Risk (RR) corresponding to an increment of 1 unit of the independent variable.