Assessing health utilities in schizophrenia. A feasibility study

Area of Science:

• Psychiatry
• Health Economics
• Quality of Life Research

Background:

• Utility measurement quantifies health state desirability, offering an alternative to traditional quality of life appraisal in chronic illnesses.
• Schizophrenia management often requires assessing patient-centered outcomes, including quality of life.

Purpose of the Study:

• To assess the feasibility and psychometric properties of obtaining accurate health state descriptions and utilities from stable schizophrenia patients.
• To compare utility measurement capabilities between schizophrenia patients and a control group with treated major depression.

Main Methods:

• Cross-sectional, case-controlled study involving 120 schizophrenia patients and 32 depression patients.
• Patients described current, worst, and ideal health states and assigned utilities using Magnitude Estimation, Rating Scale, Standard Gamble, Time Trade-Off, and Willingness-to-Pay.
• Test-retest reliability and concurrent validity with quality of life measures were assessed; clinician ratings were also collected.

Main Results:

• Schizophrenia patients accurately described health states comparable to the depression control group.
• Rating Scale, Time Trade-Off, and Willingness-to-Pay were preferred utility evaluation methods.
• High test-retest reliability (r=0.87–0.97) and acceptable validity were found; patient appraisals were independent of symptom severity and insight.

Conclusions:

• Stable schizophrenia patients can reliably and validly self-report health state descriptions and utilities.
• Patient-derived utility evaluations are valuable tools for schizophrenia outcome studies and clinical trials.
• Further methodological refinement is needed to address the complexities of utility measurement in patients with schizophrenia.