The Minimal Clinically Important Difference for the Mayo-Portland Adaptability Inventory

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Psychometrics

Background:

• The Mayo-Portland Adaptability Inventory-4 (MPAI-4) is used to assess outcomes in individuals with acquired brain injury.
• Establishing clear benchmarks for meaningful change is crucial for interpreting intervention effectiveness.

Purpose of the Study:

• To determine the Minimal Clinically Important Difference (MCID) and Robust Clinically Important Difference (RCID) for the MPAI-4.
• To establish reliable measures of response to intervention in neurorehabilitation.

Main Methods:

• Retrospective analysis of 3,087 individuals with acquired brain injury from the OutcomeInfo Database.
• Utilized both distribution- and anchor-based methods to determine MCID and RCID.
• Evaluated findings against clinical provider ratings.

Main Results:

• The MCID for the MPAI-4 was determined to be 5 T-score points (5T).
• The RCID for the MPAI-4 was determined to be 9 T-score points (9T).
• Clinical raters considered 5T and 9T changes as meaningful improvements (81-87% and 99%, respectively).

Conclusions:

• 5T represents the MCID and 9T represents the RCID for the MPAI-4.
• These values are lower than the Reliable Change Index (RCI), suggesting RCI may be statistically significant but not always clinically meaningful.
• The MCID and RCID provide valuable metrics for assessing meaningful change in intervention response for individuals with acquired brain injury.