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Phys Ther. 2011 Jan;91(1):114-21. doi: 10.2522/ptj.20090126. Epub 2010 Oct 14.

Minimal detectable change of the timed "up & go" test and the dynamic gait index in people with Parkinson disease.

Author information

1
School of Occupational Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan.

Erratum in

  • Phys Ther. 2014 Jul;94(7):1056.

Abstract

BACKGROUND:

The minimal detectable change (MDC) is the smallest amount of difference in individual scores that represents true change (beyond random measurement error). The MDCs of the Timed "Up & Go" Test (TUG) and the Dynamic Gait Index (DGI) in people with Parkinson disease (PD) are largely unknown, limiting the interpretability of the change scores of both measures.

OBJECTIVE:

The purpose of this study was to estimate the MDCs of the TUG and the DGI in people with PD.

DESIGN:

This investigation was a prospective cohort study.

METHODS:

Seventy-two participants were recruited from special clinics for movement disorders at a university hospital. Their mean age was 67.5 years, and 61% were men. All participants completed the TUG and the DGI assessments twice, about 14 days apart. The MDC was calculated from the standard error of measurement. The percentage MDC (MDC%) was calculated as the MDC divided by the mean of all scores for the sample. Furthermore, the intraclass correlation coefficient was used to examine the reproducibility between testing sessions (test-retest reliability).

RESULTS:

The respective MDC and MDC% of the TUG were 3.5 seconds and 29.8, and those of the DGI were 2.9 points and 13.3. The test-retest reliability values for the TUG and the DGI were high; the intraclass correlation coefficients were .80 and .84, respectively.

LIMITATIONS:

The study sample was a convenience sample, and the participants had mild to moderately severe PD.

CONCLUSIONS:

The results showed that the TUG and the DGI have generally acceptable random measurement error and test-retest reliability. These findings should help clinicians and researchers determine whether a change in an individual patient with PD is a true change.

PMID:
20947672
DOI:
10.2522/ptj.20090126
[Indexed for MEDLINE]

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