Table 3b: 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 80 percent level.

Years since last radon progeny exposure

Smokers

Non-smokers

Age at disease

<10

10-19

20

<10

10-19

20

<50

6

12

50

1

3

10

50-59

21

44

178

4

9

35

60-69

89

190

767

18

38

154

70

127

273

1,102

26

55

222

^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 ß×exp[1.28×SE(ß )] then adjusted to ß_smk or ß_ns as described in the text.