Ontario Ministry of Housing: Table 3
LUNG CANCER DEATHS IN CZECHOSLOVAKIA CAUSED BY RADON
Relative Risk Factors Derived From Uranium Mines in Czechoslovakia
|Radon Exposure Category (WLM)||Average Exposure (WLM)|
|Lung Cancers Observed per 1000|
|Lung Cancers Expected per 1000 |
|Excess Lung Cancers per 1000 |
EC =  - 
|Relative Risk Factor (Excess cancers per WLM per 1000 cancers expected)|
RRF = ( EC x 1000 ) / (  x  )
- The data for this table are taken from "Lung Cancer in Uranium Miners and Long-Term Exposure to Radon Daughters", by J. Sevc and E. Kunz, Health Physics, vol. 30, pp.433-437, 1976.
- These miners received much less of an accumulated dose than the Colorado Plateau miners (see Tables 1 and 2 -- Exhibits 5 and 6). In fact, most of the entries in this table fit into the first three exposure categories in Tables 1 and 2.
- In this Table, the overall average of 11 excess cancers per WLM per 1000 cancers expected is almost twice the overall average risk factor from Table 2, reflecting a higher risk per WLM among lower-exposure groups.
- Moreover, the average risk factor of 11 given here (the last entry in the last column) does not reflect the low-exposure data given in this Table which indicates a risk factor more than twice as large for exposures under 50 WLM.
- In the last column, the factor of 2 difference between the first entry (26) and the other entries (average = 13.4) should be compared with the factor of 2 difference in Table 2 between the first two entries in the last column of that Table.
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