Article

Purpose To determine (a) the discriminant validity for established fall risk
factors and (b) the predictive validity for falls of a simple test of choice
stepping reaction time (CSRT) in people with multiple sclerosis (MS). Method
People with MS (n = 210, 21-74y) performed the CSRT, sensorimotor, balance and
neuropsychological tests in a single session. They were then followed up for
falls using monthly fall diaries for 6 months. Results The CSRT test had
excellent discriminant validity with respect to established fall risk factors.
Frequent fallers (>/=3 falls) performed significantly worse in the CSRT test than
non-frequent fallers (0-2 falls). With the odds of suffering frequent falls
increasing 69% with each SD increase in CSRT (OR = 1.69, 95% CI: 1.27-2.26, p =
<0.001). In regression analysis, CSRT was best explained by sway, time to
complete the 9-Hole Peg test, knee extension strength of the weaker leg,
proprioception and the time to complete the Trails B test (multiple R(2 )= (
)0.449, p < 0.001). Conclusions A simple low tech CSRT test has excellent
discriminative and predictive validity in relation to falls in people with MS.
This test may prove useful in documenting longitudinal changes in fall risk in
relation to MS disease progression and effects of interventions. Implications for
rehabilitation Good choice stepping reaction time (CSRT) is required for
maintaining balance. A simple low-tech CSRT test has excellent discriminative and
predictive validity in relation to falls in people with MS. This test may prove
useful documenting longitudinal changes in fall risk in relation to MS disease
progression and effects of interventions.

Langue : ANGLAIS