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Validation of a Computerized test of Functional Capacity.
Richard S E Keefe1, Vicki G Davis2, Alexandra S Atkins2
1Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA; NeuroCog Trials, Inc., Durham, NC, USA.
Schizophrenia Research
|April 20, 2016
Summary
The Virtual Reality Functional Capacity Assessment Tool (VRFCAT) shows high reliability and sensitivity for measuring functional capacity in schizophrenia. This digital tool is a promising alternative to traditional assessments in clinical trials.
Area of Science:
- Neuroscience
- Psychiatry
- Medical Technology
Background:
- Schizophrenia clinical trials require functional endpoints, but current measures have limitations like resistance to change and informant dependence.
- Existing assessments for functional capacity in schizophrenia may lack sensitivity or exhibit practice effects, impacting trial validity.
Purpose of the Study:
- To evaluate the Virtual Reality Functional Capacity Assessment Tool (VRFCAT) for validity, sensitivity, and reliability in assessing functional capacity.
- To examine the correlation between VRFCAT performance and established cognitive (MCCB) and functional (UPSA) measures in schizophrenia.
- To compare VRFCAT's psychometric properties against the UCSD Performance-based Skills Assessment (UPSA).
Main Methods:
- 167 schizophrenia patients and 166 healthy controls completed VRFCAT, MCCB, and UPSA at baseline.
- VRFCAT and UPSA were re-administered at follow-up to assess test-retest reliability and practice effects.
- Statistical analyses included sensitivity (d-scores), reliability (ICC), and correlation (r-values) between measures.
Main Results:
- VRFCAT, MCCB, and UPSA demonstrated high sensitivity to impairment in schizophrenia patients (d=1.16 to 1.22).
- VRFCAT showed excellent test-retest reliability (ICC=0.81) and no significant practice effects (d=-0.04), unlike UPSA (d=0.35).
- VRFCAT completion time strongly correlated with UPSA and MCCB Composite scores in both patients and controls.
Conclusions:
- The VRFCAT is a reliable and sensitive digital tool for assessing functional capacity in individuals with schizophrenia.
- VRFCAT performance is associated with established cognitive and functional measures, supporting its construct validity.
- VRFCAT offers a promising, computerized alternative for functional capacity assessment in schizophrenia research and clinical practice.
