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TUG tests the basic mobility skills of frail elderly persons

Measures the time in seconds
for a person sitting in a standard armchair
Rise 
walk 3 m,
turn around,
walk back to the chair,
and sit down.

Podsiadlo and Richardson
in their original description of this test defined
a cut off score of >=20 seconds was shown to predict falls
in community-dwelling frail elderly people

Shumway-Cook et al in a later study
defined a cut off score of > 14 seconds to predict the risk of falling
(83% probability of being a faller)

The Centers for Disease Control (CDC)
define a cut off score of > = 12 seconds
to predict risk of falling in an elderly person (4)