Article

Standardized outcome measures with high clinical utility are of
paramount importance for clinical practice. The purpose of this study
was to examine interrater and intrarater reliability, construct validity,
discriminant ability, and smallest detectable differences of the sit-to-stand
test (STS), Timed "Up & Go" Test (TUG), and bed mobility test for people with
Parkinson disease (PD). DESIGN: A cross-sectional, psychometric evaluation study
was conducted. METHODS: A group of individuals with PD (PD group) and a group of
individuals who were healthy (control group) were recruited through local PD
groups and assessed in a movement laboratory in their "on" phase. Measurements of
time to perform one STS, TUG, and bed mobility test were collected based on video
recordings of that single performance. RESULTS: Thirty-eight individuals with PD
(Hoehn and Yahr stages I-IV) and 19 age-matched control participants were
recruited. Intraclass correlation coefficients for interrater and intrarater
reliability for the PD group ranged from .95 to .99. Bland-Altman plots showed
mean differences close to zero and narrow confidence intervals. Construct
validity was established by means of moderate to good Spearman rho correlation
coefficients with part III of the Unified Parkinson's Disease Rating Scale and
the Hoehn and Yahr stage (range=.51-.63). Timings of all tests discriminated
participants in the PD group from those in the control group and participants in
the PD group in Hoehn and Yahr stages I and II from those in Hoehn and Yahr
stages III and IV but did not discriminate "nonfallers" or those with single
falls from repeat "fallers" or "nonfreezers" from "freezers." Applicable smallest
detectable differences were established. LIMITATIONS: The results are not
generalizable to people in the late stage of PD (Hoehn and Yahr stage IV: n=3).
CONCLUSIONS: Timings of video recordings of 3 functional mobility tests with high
clinical utility showed good psychometric properties for community-dwelling,
ambulatory people with PD.

Langue : ANGLAIS