Determining reliable change on the modified fatigue impact scale (5-item version)

Area of Science:

• Neurology
• Rehabilitation Medicine
• Clinical Measurement

Background:

• Fatigue is a common and debilitating symptom in Multiple Sclerosis (MS).
• Quantifying fatigue changes over time in MS patients presents a significant clinical challenge.
• Existing research on reliable fatigue measurement in MS is limited.

Purpose of the Study:

• To evaluate the reliable change on the abbreviated Modified Fatigue Impact Scale (MFIS-5).
• To establish statistically meaningful change scores for the MFIS-5 in MS patients.
• To provide a tool for assessing fatigue fluctuations in clinical practice.

Main Methods:

• 168 MS patients completed the MFIS-5 at baseline and follow-up.
• Test-retest reliability was assessed.
• Reliable Change Indices (RCIs) were calculated to determine meaningful score differences.

Main Results:

• Statistically meaningful changes on the MFIS-5 were identified at different confidence intervals.
• A 4-point difference corresponds to the .70 confidence interval.
• A 7-point difference corresponds to the .95 confidence interval.

Conclusions:

• The MFIS-5 is a valuable tool for rapid and reliable assessment of fatigue in MS.
• The study provides specific score differences indicative of meaningful change.
• Clinicians can use the MFIS-5 to monitor fatigue progression and treatment efficacy in MS.