The Symptom Inventory Disability-Specific Short Forms for Multiple Sclerosis: Reliability and Factor Structure

This study provides empirical support for a 10-scale symptom measure for use in MS clinical research, with short forms in 5 scales tailored to have good specificity for people with mild, moderate, and severe disability and single forms for the remaining 5 scales. The PS items can serve as a screener for these disability-specific short forms, which provide choice and flexibility that are similar to a computerized adaptive test but without the reliance on real-time computer infrastructure.