Cause	Mean (%)*	Range †
Accident and environment-related causes	31	1 to 53
Gait and balance disorders or weakness	17	4 to 39
Dizziness and vertigo	13	0 to 30
Drop attack	9	0 to 52
Confusion	5	0 to 14
Postural hypotension	3	0 to 24
Visual disorder	2	0 to 5
Syncope	0.3	0 to 3
Other specified causes‡	15	2 to 39
Unknown	5	0 to 21