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Related Concept Videos

Wald-Wolfowitz Runs Test II01:17

Wald-Wolfowitz Runs Test II

The Wald-Wolfowitz runs test, commonly referred to as the runs test, is a nonparametric test used to assess the randomness of ordered data. The test evaluates the number of runs, which are consecutive sequences of similar elements within the data. If the number of runs is significantly higher or lower than expected, the data is considered non-random, indicating a detectable pattern or structure.
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...

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Minimal detectable change scores for the Wolf Motor Function Test.

Stacy L Fritz1, Sarah Blanton, Gitendra Uswatte

  • 1Arnold School of Public Health, Department of Exercise Science, Physical Therapy Program, University of South Carolina, Columbia, South Carolina 29208, USA. sfritz@mailbox.sc.edu

Neurorehabilitation and Neural Repair
|June 6, 2009
PubMed
Summary
This summary is machine-generated.

The Wolf Motor Function Test (WMFT) now has established standards for measurement error. These findings help distinguish true changes from random results in stroke patients undergoing rehabilitation.

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Area of Science:

  • Rehabilitation science
  • Clinical measurement
  • Stroke recovery

Background:

  • The Wolf Motor Function Test (WMFT) is a validated, impairment-based assessment tool.
  • Previous studies have established the reliability and validity of the WMFT.
  • Standards for interpreting meaningful change in WMFT scores are currently lacking.

Purpose of the Study:

  • To establish the standard error of measurement (SEM) for the WMFT.
  • To determine the minimal detectable change (MDC) at a 95% confidence level (MDC95) for the WMFT.

Main Methods:

  • Data were gathered from 96 individuals with sub-acute stroke across 6 university laboratories.
  • Participants completed the WMFT twice, 2 weeks apart, with no intervention in between.
  • Blinded, trained, and standardized evaluators administered the assessments.

Main Results:

  • The WMFT Performance Time score demonstrated a SEM of 0.2 seconds and an MDC95 of 0.7 seconds.
  • Individual task timed items showed higher variability, with MDC95 ranging from 1.0 to 3.4 seconds.
  • The WMFT Functional Ability Scale yielded an average SEM of 0.1 points and an MDC95 of 0.1 points.

Conclusions:

  • The calculated SEM and MDC values provide crucial benchmarks for interpreting WMFT results.
  • Clinicians and researchers can use these metrics to confidently differentiate true therapeutic effects from measurement error.
  • An observed change exceeding the MDC95 suggests a statistically significant and reliable improvement in motor function.