Lost Alzhiemer's Patients Behavior:
an unpublished study of 25 cases in Virginia
over 5 years by Robert Koester  October 5, 1991

Median Distance:        0.5 mi.
Mean Distance:          0.57 mi.
S.D.                    0.5 mi.
Maximum                 2.0 mi.
90% within 1.1 mi.
96% within 1.5 mi.
25% found in heavy brush
38% found in a drainage
8% found on roads
12% found in PLS or "target" house
17% in open fields

Control:  Elderly non-Alzhemier's Patients had median of 2.0 miles, range 0 to "7 or 8" miles