Table 5.
Excess relative risks of lung cancer mortality by mean radon exposure, joint cohort < 100 WLM
| Cohort | Lung cancer deaths | Person-years | Mean cumulativea exposure (WLM) | ERR/WLMb (MLE) | 95% CIc |
|---|---|---|---|---|---|
| Joint | 408 | 394,236 | 36.42 | 0.022 | 0.013–0.034 |
| Czech | 223 | 179,837 | 45.1 | 0.021 | 0.010–0.040 |
| French | 62 | 80,286 | 32.9 | 0.020 | 0.005–0.051 |
| Beaverlodge | 123 | 134,113 | 32.3 | 0.024 | 0.009–0.047 |
WLM working-level months, ERR/WLM excess relative risk per working-level month, CI confidence interval, MLE maximum likelihood estimate
aMean cumulative radon exposure (5-year lagged, WLM) weighted by person-years at risk
bPoisson regression model, for grouped survival data, with background stratification by sub-cohort (3 categories) and age at risk (12 categories)
cLikelihood bounds for exposure variable (WLM)