Table III.

Overall cumulative hazard ratio (with 95%CI) of lung cancer mortality associated with alternative scenarios of exposure histories to radon, as predicted from models 1, 4, 5, and 8, described in Table II

	Model 1	Model 4	Model 5	Model 8
Exposure scenario	x · c	x · w(x,ℓ)	f(x) · c	f · w(x,ℓ)
20 WLM/year in the last 10 years	1.05 (1.04–1.06)	1.04 (1.03–1.05)	1.33 (1.22–1.46)	1.52 (1.31–1.76)
100 WLM/year in the last 10 years	1.27 (1.22–1.33)	1.20 (1.13–1.27)	1.96 (1.73–2.22)	2.37 (1.87–2.99)
20 WLM/year in the last 20 years	1.11 (1.09–1.14)	1.11 (1.09–1.14)	1.92 (1.56–2.35)	3.12 (2.29–4.24)
20 WLM/year 10–19 years ago	1.06 (1.05–1.07)	1.07 (1.06–1.09)	1.43 (1.28–1.61)	2.05 (1.70–2.48)
20 WLM/year 30–39 years ago	1.06 (1.05–1.07)	1.05 (1.00–1.11)	1.43 (1.28–1.61)	1.04 (0.64–1.70)

WLM, working-level months.