PDDS
Patient Determined Disease Steps
A single-item, patient-reported classification of mobility-related disability in multiple sclerosis.
At a Glance
- Population
- Adults with multiple sclerosis
- Number of Items
- 1 item (9-point ordinal scale)
- Instrument Type
- PROM
- Digital Administration Availability
- Suitable for self-report electronic administration
- Automated Scoring Availability
- Not applicable — patient selects a single disability category directly
- Suitable Use Settings
- Multiple sclerosis clinical care, patient registries, and research
About the Instrument
PDDS was adapted from the clinician-administered “Disease Steps” scale (Hohol et al.) to allow people with multiple sclerosis to self-report their level of mobility-related disability, and has been used extensively by North American MS patient registries.
What It Measures
Overall mobility-related disability due to multiple sclerosis, from normal function to bedridden.
Digital Administration
Delivered electronically through the PROMinsight platform as part of a digital patient-reported outcomes workflow.
Scoring / Reporting
Patients select the one of nine ordinal categories (0 = normal through 8 = bedridden) that best matches their current mobility.
Use in Research / Clinical Care / Clinical Trials
Used as a low-burden self-report surrogate for clinician-rated disability scales in large MS patient registries and research studies.
Enquire About This Instrument
Interested in using the PDDS in your research, clinical programme or study? Contact PROMinsight to discuss access.
Enquire About This Instrument