Tamar, the odds ratio (OR) describes the increased risk associated with Radon exposure. Check out Table 4: as exposure to radon increases you can see the increasing association with lung Ca. At higher levels of household exposure, live participants were more than twice as likely to have lung cancer compared to the lowest exposure group. The difference is up to 340% for some types of lung cancer in Table 6.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
