A comparative analysis of Patient-Reported Expanded Disability Status Scale tools.

Area of Science:

• Neurology
• Clinical Research Methodology
• Patient-Reported Outcomes

Background:

• Patient-Reported Expanded Disability Status Scale (PREDSS) tools offer a practical alternative to the Expanded Disability Status Scale (EDSS).
• PREDSS tools are particularly useful in long-term studies, remote settings, or high-demand clinical environments.
• Previous comparisons between PREDSS and EDSS utilized diverse metrics, necessitating a unified analysis.

Purpose of the Study:

• To conduct an individual patient data level analysis of all available PREDSS tools.
• To compare the performance of various PREDSS tools against the established EDSS.
• To provide data for informed selection and improvement of PREDSS tools.

Main Methods:

• Systematic literature search identified eight validated PREDSS tools covering the full EDSS range.
• Individual patient data were obtained for five PREDSS tools.
• Spearman's rho and Bland-Altman methods were employed to assess correlation and agreement.

Main Results:

• Excellent correlation was observed between EDSS and all evaluated PREDSS tools.
• Agreement between PREDSS and EDSS improved with increasing levels of disability.
• The visual functional system emerged as the primary predictor influencing PREDSS-EDSS differences.

Conclusions:

• This comprehensive analysis aids researchers and clinicians in selecting appropriate PREDSS tools based on specific study needs.
• Findings support the utility of PREDSS as a reliable measure of disability in neurological studies.
• The study provides a foundation for refining existing PREDSS tools for enhanced accuracy and clinical utility.