RASCH ANALYSIS OF THE FUNCTIONAL INDEPENDENCE MEASURE (FIM(TM)) MASTERY TEST

Objective: To evaluate the range, distribution, and unidimensionality of the items included in Version Five of the Functional Independence M easure (FIM(TM)) Mastery Test, a 54-item written examination used to d etermine FIM rating proficiency by professionals who administer the in strument. Study Design: Rasch analysis of the test results of 6,645 cl inicians who took the FIM Mastery Test in 1996. Results: Overall, clin icians performed well on the test. When the mean item difficulty was c entered at 50, and the test scores were calibrated to range from 0 to 100 logits, the mean person ability level was 77 logits, Fit statistic s indicated that the test was unidimensional, measuring a common theme . While the item separation index value was 17, 22 items were not effi cient in determining the clinicians' ability levels. Analysis of the l egit values by the correct response showed that descriptions of Total Assistance (Level 1) and Complete Independence (Level 7) were easiest for clinicians to score correctly. Conclusion: The examination measure s the common theme of FIM knowledge in a consistent manner, Further, t he results suggest that the FIM Mastery Test may be shortened, perhaps by eliminating one of the three case studies, and improved by adding more challenging questions, In addition, FIM training should focus on distinguishing among levels 2 through 6, since clinicians had more dif ficulty identifying these levels. (C) 1998 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation.