Table 3.
Relative risk of selected circulatory disease mortality (1950–2016) by the average number of cigarettes smoked daily among the cohort of Newfoundland fluorspar miners
| Cigarettes smoked daily | Deaths | Person-years of follow-up | Relative Risk* (95% CI) |
Relative Risk*† (95% CI) |
||
|---|---|---|---|---|---|---|
| Circulatory disease mortality | ||||||
| < 15 | 50 | 13,520 | 1.0 | 1.0 | ||
| 15– < 21.7 | 75 | 16,933 | 1.09 | 0.76–1.56 | 1.12 | 0.79–1.60 |
| 21.7 + | 85 | 14,900 | 1.55 | 1.10–2.19 | 1.61 | 1.13–2.27 |
| Unknown | 265 | 36,300 | 1.16 | 0.86–1.58 | ||
| Ischemic heart disease | ||||||
| < 15 | 30 | 13,520 | 1.0 | 1.0 | ||
| 15– < 21.7 | 45 | 16,933 | 0.99 | 0.63–1.57 | 1.02 | 0.65–1.62 |
| 21.7+ | 60 | 14,900 | 1.67 | 1.09–2.57 | 1.71 | 1.11–2.64 |
| Unknown | 150 | 36,300 | 1.14 | 0.78–1.68 | ||
| Acute myocardial infarction | ||||||
| < 15 | 20 | 13,520 | 1.0 | 1.0 | ||
| 15– < 21.7 | 25 | 16,933 | 0.88 | 0.49–1.59 | 0.90 | 0.50–1.53 |
| 21.7+ | 35 | 14,900 | 1.61 | 0.93–2.78 | 1.62 | 0.94–2.79 |
| Unknown | 90 | 36,300 | 1.05 | 0.64–1.71 | ||
*Relative risks were adjusted by attained age, calendar period, and average number of cigarettes smoked daily
†Miners with missing smoking data were excluded