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Advancing Dyslexia Assessment in Children Through Computerized Testing

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Factor structure of the Multnomah Community Ability Scale--longitudinal analysis.

Diego G Bassani¹, Carolyn S Dewa, Terry Krupa

¹Centre for Addiction and Mental Health, Toronto, Ontario, Canada. diego_bassani@camh.net

Psychiatry Research

|April 14, 2009

Summary

The Multnomah Community Ability Scale (MCAS) showed poor psychometric fit for measuring community functioning in individuals with severe mental illness. Findings suggest reconsidering its use as a scale and exploring its items for disability assessment.

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Area of Science:

Psychiatry
Psychometrics
Community Mental Health

Background:

Community mental health services require outcome measures tailored to community functioning, distinct from medical models.
The Multnomah Community Ability Scale (MCAS) was developed to assess broad dimensions of community functioning for clinical and evaluation purposes.

Purpose of the Study:

To assess the structural consistency and fit of the MCAS as a measure of community functioning.
To evaluate the scale's psychometric properties and invariance over time in a severe and persistent mental illness population.

Main Methods:

Confirmatory factor analysis (CFA) was used on a longitudinal sample (n=408) of individuals receiving community mental health services.
Exploratory factor analysis (EFA) was conducted, and multiple factor solutions (four-, three-, two-, and one-factor) were tested after item exclusion.

Main Results:

None of the previously hypothesized factor solutions achieved a good fit.
A high degree of invariance over time was observed, but overall model fit remained poor.
Excluding two items did not improve the fit of alternative factor solutions.

Conclusions:

The MCAS did not demonstrate adequate psychometric fit as a scale for measuring community functioning in this population.
Alternative interpretations of the MCAS are suggested, including using its items as an index for disability assessment.