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The Functional Independence Measurement (FIM) is a new functional status instrument for use among rehabilitation inpatients, but its validity and reliability have been only partially established. Because of its rapid dissemination, we sought further evidence concerning the FIM's internal consistency, responsiveness over time, and construct validity. We examined Uniform Data System (UDS) data on 11,102 general rehabilitation inpatients from the Pacific Northwest. Mean age was 65 and 51% were male. The most common diagnoses were stroke (52%), orthopedic conditions (10%), and brain injury (10%). Internal consistency of the FIM was calculated using Cronbach's α. To assess FIM responsiveness, we examined differences between admission and discharge FIM scores. For construct validation purposes, we hypothesized that the FIM would vary with age, comorbidity, discharge destination, and impairment …