Table 1.

Geographic Location and Sex Distribution of Research Participants

Variable	Dog-exposed group	Environmental control group
Sex (male), %	57.8	73.9
Age, %
20–30	11.3	13.0
30–40	14.1	4.4
40–50	21.1	8.7
50–60	29.6	34.8
60–70	16.9	26.1
70–80	5.6	13.0
N/A	1.4	0
Location, %
Northeast	2.8	0
Mid-Atlantic	19.7	0
Southeast	12.7	0
Midwest	25.4	100
West	1.4	0
N/A	38.0	0

Dog-exposed group: hunting dog caretakers; environmental control group: Audubon society members/State Parks employees.