© 2003 by Oxford University Press and the Maryland Psychiatric Research Center (MPRC)
The Multidimensional Scale of Independent Functioning: A New Instrument for Measuring Functional Disability in Psychiatric Populations
Director, Center for Neuropsychiatric Outcome and Rehabilitation Research, Hillside Hospital, North Shore-Long Island Jewish Health System Glen Oaks, NY, and Associate Professor of Psychiatry, Albert Einstein College of Medicine Bronx, NY
Assistant Director, Center for Neuropsychiatric Outcome and Rehabilitation Research
Research Scientist, Nathan Kline Institute for Psychiatric Research Orangeburg, NY, and Associate Professor, New York University School of Medicine, Department of Psychiatry New York, NY
Send reprint requests to Dr. J. Jaeger, Director, Center for Neuropsychiatric Outcome and Rehabilitation Research, Hillside Hospital, 75-59 263rd Street, Glen Oaks, NY 11004; e-mail: jaeger{at}lij.edu
The Multidimensional Scale of Independent Functioning (MSIF) is a new instrument for rating functional disability in psychiatric outpatients. The MSIF differs from other disability rating scales by providing discrete ratings of (1) role responsibility, (2) presence and level of support, and (3) performance quality. The MSIF, which consists of a semistructured interview and detailed rating anchors, was validated in 114 psychiatric outpatients. The instrument had good criterion, discriminative, interrater, and construct validity. Correlations between comparable ratings on the Social Adjustment Scale II (SAS II) ranged from 0.78 to 0.86. Nevertheless, redundancy analysis using canonical correlation demonstrated that, although the two instruments overlap, the MSIF contains information that is not contained in the SAS II. Furthermore, there was only modest shared variance with conceptually non-overlapping subscales in the SAS II. Interrater reliability (intraclass correlation coefficients) ranged from 0.74 to 1.00 for global and subscale scores. MSLF subscales performed as expected with respect to external validators such as hours of employment, earned income, supported versus nonsupported employment and housing, and mainstream versus nonmainstream educational status. MSIF global ratings were modestly correlated with IQ and psychopathology ratings, consistent with reports in the literature. Construct validity, estimated using Cronbach's alpha coefficient, was 0.72. The MSIF is a promising new instrument designed to circumvent several limitations with existing functional outcome instruments for longitudinal studies, intervention research, and services research.
Keywords: Disability / rating scales / functional outcome / independent functioning / intervention research
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