Table 3a: 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.

Years since last radon progeny exposure

Smokers

Non-smokers

Age at disease

<10

10-19

20

<10

10-19

20

<50

8

17

68

2

3

14

50-59

28

60

243

6

12

49

60-69

121

259

1047

24

52

211

70

174

376

1,503

35

75

303

^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, ß in Table 1 is replaced by ß_smk or ß_ns as described in the text.