Table 1. Counts of patients for the Canadian and Massachusetts by demographic and exposure variables.
| Descriptive characteristics | Categories | Numbers with lung dose <0.5 Gy/dose unrestricted | ||
|---|---|---|---|---|
| Canada | Massachusetts | Total | ||
| Canadian province | Nova Scotia | 3431/4408 | 0/0 | 3431/4408 |
| non-Nova Scotia | 44,637/59,299 | 0/0 | 44,637/59,299 | |
| Massachusetts subcohort | Massachusetts I | 0/0 | 1101/1744 | 1101/1744 |
| Massachusetts II | 0/0 | 5327/6986 | 5327/6986 | |
| Massachusetts III | 0/0 | 4180/4838 | 4180/4838 | |
| Gender | female | 23,295/31,787 | 4934/6633 | 28,229/38,420 |
| male | 24,773/31,920 | 5674/6935 | 30,447/38,855 | |
| Smoking status | never | 2447/3456 | 2530/3390 | 4977/6846 |
| ever | 7099/10,172 | 5108/6474 | 12,207/16,646 | |
| unknown | 38,522/50,079 | 2970/3704 | 41,492/53,783 | |
| Alcohol status | never | 0/0 | 5392/7013 | 5392/7013 |
| ever | 0/0 | 2633/3281 | 2633/3281 | |
| unknown | 0/0 | 2583/3274 | 2583/3274 | |
| Tuberculosis status | minimal | 12,899/15,264 | 2187/2643 | 15,086/17,907 |
| moderate | 15,299/22,696 | 3848/5229 | 19,147/27,925 | |
| advanced | 10,609/16,253 | 3832/4932 | 14,441/21,185 | |
| unrecorded | 9261/9494 | 741/764 | 10,002/10,258 | |
| Age at entry, year | 0–19 | 10,447/14,249 | 1344/1804 | 11,791/16,053 |
| 20–39 | 26,806/37,655 | 5220/7399 | 32,026/45,054 | |
| 40–59 | 8803/9765 | 3019/3322 | 11,822/13,087 | |
| ≥60 | 2012/2038 | 1025/1043 | 3037/3081 | |
| Age at first exposure, year | not screened | 38,775/38,775 | 7229/7229 | 46,004/46,004 |
| 0–19 | 1295/4500 | 412/1098 | 1707/5598 | |
| 20–39 | 6570/17,888 | 2207/4210 | 8777/22,098 | |
| 40–59 | 1363/2448 | 712/971 | 2075/3419 | |
| ≥60 | 65/96 | 49/60 | 113/156 | |
| Age at study exit, years | 0–54 | 9222/11,696 | 2834/3562 | 12,056/15,258 |
| 55–64 | 14,025/19,117 | 1635/2014 | 15,660/21,131 | |
| 65–74 | 14,470/20,818 | 2635/3286 | 17,105/24,104 | |
| ≥75 | 10,351/12,676 | 3504/4706 | 13,855/17,382 | |
| Cumulative lung dose, Gy | 0 | 38,775/38,775 | 7754/7754 | 46,529/46,529 |
| >0–0.49 | 9293/9293 | 2854/2854 | 12,147/12,147 | |
| 0.50–0.99 | 0/5038 | 0/1123 | 0/6161 | |
| 1.00–1.99 | 0/6343 | 0/1241 | 0/7584 | |
| ≥2.00 | 0/4258 | 0/596 | 0/4854 | |
| Lung dose rate, Gy/year | 0 | 38,775/38,775 | 7754/7754 | 46,529/46,529 |
| >0.0–0.19 | 2308/3141 | 1271/1562 | 3579/4703 | |
| 0.20–0.49 | 2585/9429 | 1040/2777 | 3625/12,206 | |
| 0.50–4.99 | 4387/12,349 | 543/1475 | 4930/13,824 | |
| ≥5.00 | 13/13 | 0/0 | 13/13 | |
| Total | 48,068/63,707 | 10,608/13,568 | 58,676/77,275 | |
In each cell we provide numbers of persons with cumulative dose <0.5 Gy (to the left of the oblique dash) and without restriction on dose (to the right of the oblique dash) in the respective cohorts (Canada, Massachusetts, total (Canada + Massachusetts)).