A Systematic Review of the Validity and Reliability of the Patient-Determined Disease Steps Scale.
Kathryn C FitzgeraldCaitlin McFadyenLauren YaegerAmber SalterPublished in: International journal of MS care (2022)
In this systematic review, the PDDS scale demonstrated criterion and construct validity for assessing disability in individuals with MS who have mild to moderate disabilities. This review also supports the test-retest reliability of the PDDS scale, although further studies with larger samples are needed.