Inter-evaluator reliability of the ALS functional rating scale.

Area of Science:

• Neurology
• Clinical Trials
• Patient-Reported Outcomes

Background:

• The ALS Functional Rating Scale-Revised (ALSFRS-R) is crucial for tracking ALS progression and clinical trial outcomes.
• Traditionally, patient or caregiver evaluations were intended, but healthcare providers commonly conduct ratings.
• Discrepancies in ALSFRS-R scoring based on evaluator type (provider, patient, caregiver) are not well-established.

Purpose of the Study:

• To investigate potential differences in ALSFRS-R scoring when evaluations are performed by healthcare providers versus patients or caregivers.
• To assess the impact of changing evaluators on ALSFRS-R scores within a clinical trial context.

Main Methods:

• Comparative analysis of ALSFRS-R scores based on evaluator identity (provider, patient, caregiver).
• Modeling the statistical influence of evaluator changes on trial outcomes, simulating a scenario with remote final assessments.
• Utilizing visit-specific data to identify scoring variations.

Main Results:

• Overall, all evaluator types demonstrated similar trends in functional changes over time.
• Significant visit-specific differences were observed, with higher ALSFRS-R scores when patients and providers were the evaluators.
• Simulated changes in evaluators for 25% of final assessments resulted in a minimal score change (less than one point).

Conclusions:

• The ALSFRS-R demonstrates consistent tracking of functional changes across different evaluator types.
• Despite minor visit-specific variations, the ALSFRS-R is robust and can be reliably used even with changes in evaluators during clinical trials.