Table.

Demographic and clinical information (mean ± standard deviation) unless otherwise noted of single-time and recurrent fallers and nonfallers who completed 6-month prospective fall diary and positron emission tomography imaging study. For significant overall group effects, Duncan's Multiple Range post hoc testing was used to compare differences between subgroups.

Variable	Nonfallers (n = 51)	Single-Time Fallers (n = 21)	Recurrent Fallers (n = 5)	Group Effect
Sex (n: F/M)	28/23	11/10	4/1	c2 = 1.30*
Age	59.8 ± 16.2	62.8 ± 16.6	72.8 ± 16.9	f = 1.56*
Body Mass Index (kg/m2)	27.2 ± 5.2	26.9 ± 4.9	25.3 ± 2.7	f = 0.32*
MMSE	29.5 ± 0.8	29.5 ± 0.9	29.8 ± 0.5	f = 0.32*
Berg Balance Scale	54.9 ± 2.0a	53.1 ± 3.8ab	51.2 ± 5.0b	f = 5.62†
Motor UPDRS	3.3 ± 3.8	3.5 ± 4.6	4.2 ± 4.7	f = 0.13*
Ankle Vibration (s)	10.4 ± 4.5	10.4 ± 5.4	13.5 ± 2.6	f = 1.03*

Note: Subgroup means with same letter are not significantly different; i.e., nonfallers are significantly different from recurrent fallers, but single-time fallers are not significantly different from either non- or recurrent fallers.

^*p > 0.05.

^†p = 0.005.

F = female, M = male, MMSE = Mini-Mental State Examination, UPDRS = Unified Parkinson's Disease Rating Scale.