Publication date: September 2018
Source: Archives of Physical Medicine and Rehabilitation, Volume 99, Issue 9
Author(s): Sarah Gunn, Gerald H. Burgess, John Maltby
Abstract
Objective
To explore the factor structure of the UK Functional Independence Measure and Functional Assessment Measure (FIM+FAM) among focal and diffuse acquired brain injury patients.
Design
Criterion standard.
Setting
A National Health Service acute acquired brain injury inpatient rehabilitation hospital.
Participants
Referred sample of adults (N=447) admitted for inpatient treatment following an acquired brain injury significant enough to justify intensive inpatient neurorehabilitation
Intervention
Not applicable.
Outcome Measure
Functional Independence Measure and Functional Assessment Measure.
Results
Exploratory factor analysis suggested a 2-factor structure to FIM+FAM scores, among both focal-proximate and diffuse-proximate acquired brain injury aetiologies. Confirmatory factor analysis suggested a 3-factor bifactor structure presented the best fit of the FIM+FAM score data across both aetiologies. However, across both analyses, a convergence was found towards a general factor, demonstrated by high correlations between factors in the exploratory factor analysis, and by a general factor explaining the majority of the variance in scores on confirmatory factor analysis.
Conclusions
Our findings suggested that although factors describing specific functional domains can be derived from FIM+FAM item scores, there is a convergence towards a single factor describing overall functioning. This single factor informs the specific group factors (eg, motor, psychosocial, and communication function) after brain injury. Further research into the comparative value of the general and group factors as evaluative/prognostic measures is indicated.
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