Interpreting Action Research Arm Test Assessment Scores to Plan Treatment

Research output: Contribution to journalArticle


  • Emily S. Grattan
  • Craig A. Velozo
  • Elizabeth R. Skidmore
  • Stephen J. Page
  • Michelle L. Woodbury

External Institution(s)

  • Medical University of South Carolina
  • University of Pittsburgh
  • Department of Veterans Affairs


Original languageEnglish (US)
Pages (from-to)64-73
Number of pages10
JournalOTJR Occupation, Participation and Health
Issue number1
StatusPublished - Jan 1 2019


Rasch keyforms can help interpret clinical assessment scores. The Action Research Arm Test (ARAT) is a commonly used assessment, yet no keyform currently exists. The aim is to provide a keyform for the ARAT and demonstrate how a clinician can use the keyform to design optimally challenging rehabilitation sessions. Secondary analysis of ARAT data (n = 122) using confirmatory factor and Rasch analyses were used to examine the measurement properties and generate a keyform. The item standardized factor loadings were >0.40 (range = 0.82-0.96) and R2 values were >.60 (range =.65-.96). All items exhibited adequate infit statistics with point measure correlations >.60 (range =.72-.97). Person reliability was.98, and person separation was 7.07. Item-difficulty measures ranged from −2.78 logits to 2.64 logits. The ARAT has strong measurement properties, and a keyform was provided. We showed how the keyform can be utilized by clinicians to interpret scores, set goals, and plan treatment.

    Research areas

  • Rasch analysis, assessment, rehabilitation, stroke, upper extremity

Citation formats


Grattan, E. S., Velozo, C. A., Skidmore, E. R., Page, S. J., & Woodbury, M. L. (2019). Interpreting Action Research Arm Test Assessment Scores to Plan Treatment. OTJR Occupation, Participation and Health, 39(1), 64-73.


Grattan, ES, Velozo, CA, Skidmore, ER, Page, SJ & Woodbury, ML 2019, 'Interpreting Action Research Arm Test Assessment Scores to Plan Treatment', OTJR Occupation, Participation and Health, vol. 39, no. 1, pp. 64-73.