Table 1.

Descriptive summary of 1987 radon values in Kentucky by geologic rock formation category, with analysis of variance post-hoc comparisons (N = 309).

Formation category	Sample size (n)	Median	Range	Post-hoc comparisonsa
K	5	8.10	5.20–11.90	a b c d f g h i j
F	40	5.40	0.70–25.00	a b c d
N	41	3.50	0.50–31.20	a b c d f
L	28	2.75	0.00–20.20	a b c d f g i
M	15	2.30	0.50–14.80	*
C	9	2.20	0.90–6.80	*
I	9	1.90	0.70–11.70	*
E	23	1.80	0.50–22.30	*
G	45	1.10	0.50–7.30	e f g h i j
H	13	1.00	0.50–6.60	a c d e f g h i j
J	14	0.90	0.50–13.70	a d e f g h i j
D	36	0.85	0.00–10.40	a e f g h i j
A	20	0.70	0.50–8.20	a d e f g h i j
B	11	0.60	0.50–2.70	a e f g h i j

“*” These medians did not differ significantly from any other group.

^aMedians with the same lower case letter are not significantly different from each other at α = .0005.