This dataset contains anonymized, participant-level measurements from study PI20/00403, including demographic and clinical descriptors, cognitive/psychological scales, motor/functional outcomes, executive function tasks (Stroop; Go/No-Go), and spatiotemporal gait parameters obtained under single-task and dual-task conditions at multiple timepoints (baseline/PRE, post-intervention/POST, and follow-up/RET). Dual-task effects (usually the cost of the dual task) (DTE%) are included for gait variables and were computed based on research by Plummer & Eskes, 2015.