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Validity and Reliability of the Movement Ability Measure: A Self-Report Instrument Proposed for Assessing Movement Across Diagnoses and Ability Levels

DD Allen, PT, PhD, is Adjunct Assistant Professor, Department of Physical Therapy, Samuel Merritt College, Oakland, Calif, and Post-Doctoral Fellow, Health and Disability Research Institute, Boston University, Boston, Mass.

allendianed{at}gmail.com

Background and Purpose: Physical therapists lack instruments that assess movement across diagnoses and ability levels while focusing on physical therapy–specific outcomes. This article describes the creation of a Movement Ability Measure (MAM) and initial evidence of validity and reliability.

Subjects: More than 300 adult volunteers with various movement levels completed the 24-item questionnaire.

Methods: Item response theory methods were used to create the MAM and gather evidence of content and construct validity, test-retest and other types of reliability, and concurrent validity with the California Functional Evaluation instrument and self-acknowledgement of movement problems.

Results: The intraclass correlation coefficient for test-retest reliability was .92. Person separation reliability was .98. Correlation (r) with the California Functional Evaluation instrument was .76. Respondents who denied having movement problems perceived a significantly higher level of movement ability than those who claimed to have a little, some, or a lot of movement problems in the preceding week.

Discussion and Conclusion: The MAM shows promise for documenting perceived movement ability across ability levels and diagnoses.

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