Table 3c: WLM for which a lung cancer case is "more likely than not" due to radon progeny exposurea, based on probability of causation exceeding 0.5. Estimated relative risks are increased to incorporate statistical uncertainty at the 90 percent level.

Years since last radon progeny exposure

Smokers

Non-smokers

Age at disease

<10

10-19

20

<10

10-19

20

<50

5

11

46

1

2

9

50-59

19

40

163

4

8

33

60-69

81

174

703

16

35

141

70

117

250

1,010

24

50

203

^a Model used in the model to compute PC=0.5, RR = 1 + ß × w^k × tsle × age with time since last exposure and age defined by categories. For calculations, in Table 1 is replaced by ×exp[1.64×SE(ß )] then adjusted to ß_smk or ß_ns as described in the text.