a Model used in the model to compute PC=0.5, RR = 1 + ß ×
dk × Ýyfe × tsle × age ×
t(age - 60) with time since last exposure, and year first exposed
defined by categories. For calculations, in Table 2 is replaced by smk or
ns as described in the text. For computing RR with age categories, mean ages
44.5, 54.8, 63.9, and 75.7 used.
b A value of 0.0 years exposed denotes exposure to radon progeny
which is less than 0.05 years (or 0.6 mos = 0.05×12, or 102 working hrs =