Table 4.
Relative risk of selected circulatory disease mortality (1950–2016) by cumulative radon exposure among the cohort of Newfoundland fluorspar miners
| Cumulative exposure to radon in WLM (quantiles) | Deaths | Person-years of follow-up | Relative Risk* (95% CI) |
Relative Risk (95% CI)*† |
|||||
|---|---|---|---|---|---|---|---|---|---|
| Circulatory disease mortality | |||||||||
| 0 | 105 | 17,510 | 1.0 | 1.0 | |||||
| > 0– < 4.6 | 90 | 24,315 | 0.99 | 0.73–1.34 | 1.05 | 0.55–1.99 | |||
| 4.6– < 25.9 | 95 | 16,715 | 1.00 | 0.75–1.34 | 1.23 | 0.66–2.02 | |||
| 25.9– < 94.7 | 95 | 11,400 | 1.10 | 0.82–1.47 | 1.21 | 0.70–2.14 | |||
| 94.7+ | 95 | 11,710 | 1.03 | 0.76–1.40 | 1.06 | 0.61–1.85 | |||
| Ischemic heart disease | |||||||||
| 0 | 55 | 17,510 | 1.0 | 1.0 | |||||
| > 0– < 4.6 | 55 | 24,315 | 0.98 | 0.66–1.45 | 1.24 | 0.55–2.80 | |||
| 4.6– < 25.9 | 60 | 16,715 | 1.06 | 0.73–1.56 | 1.31 | 0.63–2.72 | |||
| 25.9– < 94.7 | 60 | 11,400 | 1.19 | 0.82–1.74 | 1.31 | 0.62–2.77 | |||
| 94.7+ | 55 | 11,710 | 0.99 | 0.66–1.48 | 1.14 | 0.55–2.37 | |||
| Acute myocardial infarction | |||||||||
| 0 | 30 | 17,510 | 1.0 | 1.0 | |||||
| > 0– < 4.6 | 30 | 24,315 | 1.08 | 0.64–1.82 | 1.30 | 0.42–3.98 | |||
| 4.6– < 25.9 | 30 | 16,715 | 1.01 | 0.60–1.70 | 1.26 | 0.47–3.41 | |||
| 25.9– < 94.7 | 40 | 11,400 | 1.36 | 0.83–2.23 | 1.13 | 0.41–3.12 | |||
| 94.7+ | 40 | 11,710 | 1.39 | 0.84–2.30 | 1.56 | 0.60–4.06 | |||
| Cerebrovascular disease | |||||||||
| 0 | 10 | 17,510 | 1.0 | ||||||
| > 0– < 4.6 | 10 | 24,315 | 0.81 | 0.33–2.01 | RRs suppressed | ||||
| 4.6– < 25.9 | 15 | 16,715 | 1.56 | 0.72–3.40 | Due to small | ||||
| 25.9– < 94.7 | 15 | 11,400 | 1.26 | 0.56–2.85 | Counts | ||||
| 94.7+ | 10 | 11,710 | 0.69 | 0.26–1.86 | |||||
*Relative risks were adjusted by attained age, calendar period, and average number of cigarettes smoked daily
†Miners with missing smoking data were excluded