A community ability scale for chronically mentally ill consumers: Part I. Reliability and validity

Area of Science:

• Psychiatry
• Psychology
• Health Services Research

Background:

• Chronic mental illness presents significant challenges for community-based care.
• Accurate assessment of functioning is crucial for effective treatment and resource allocation.
• Existing instruments may not adequately capture the nuances of disability in this population.

Purpose of the Study:

• To develop and validate the Multnomah Community Ability Scale (MCAS).
• To create a reliable and efficient instrument for assessing functioning in chronically mentally ill individuals.
• To provide a tool for case managers to quantify client disability and inform service delivery.

Main Methods:

• Development of a 17-item scale by case managers.
• Rigorous reliability testing, including inter-rater and test-retest assessments.
• Validation through correlation with criterion variables like hospitalization length and clinician ratings.

Main Results:

• The Multnomah Community Ability Scale demonstrated good inter-rater and test-retest reliability.
• Scale scores showed high correlations with established measures of clinical severity and outcomes.
• The MCAS effectively predicted future hospital admissions.

Conclusions:

• The Multnomah Community Ability Scale is a reliable and valid instrument for assessing functioning in chronically mentally ill persons.
• The MCAS can be utilized for case mix description, progress monitoring, service assignment, and reimbursement.
• This scale offers a practical tool for improving care management in community mental health settings.