Comparison of estimated regression beta coefficients* and standard errors for brain cancer and cumulative magnetic field exposure in the electrical worker cohort
| Ungrouped Poisson | Proportional hazards | Grouped Poisson | ||
|---|---|---|---|---|
| From proportional hazards and ungrouped Poisson regression with continuous exposure variables and grouped Poisson regression with quantitative exposure scores assigned by two methods, as shown. | ||||
| *Beta coefficients represent the estimated change in the log rate or hazard or brain cancer per μT-year exposure to 60 Hz magnetic fields. | ||||
| †Exposure categories defined by deciles of the population distribution of exposure. Scores assigned to exposure categories based on mean values for all person-time accrued in the category. | ||||
| ‡Exposure categories defined by deciles of the distribution of exposure among cases. Scores assigned to exposure categories based on mean values for all person-time accrued in the category. | ||||
| Model | β (SE) | β (SE) | β† (SE) | β‡ (SE) |
| Model 1: age, exposure | 0.0842 (0.0375) | 0.0842 (0.0375) | 0.1483 (0.0503) | 0.1123 (0.0392) |
| Model 2: age, calendar time, race, exposure | 0.0910 (0.0380) | 0.0910 (0.0380) | 0.1479 (0.0508) | 0.1183 (0.0396) |