Results of motor and cognitive performance (median, min–max) in the dual-task experiment in group comparison: Cognitive performance was measured by the number of arithmetic steps completed with and without a motor challenge (with eyes open and closed, respectively), as well as the total number of arithmetic steps. Motor performance was measured by the mean speed of body sway in °/s (MSV3D) under the single-task, motor challenge, cognitive challenge, and combined task conditions
| Feature | HC | pwMS | Test value* (P) |
|---|---|---|---|
| Motor feature | |||
| MSV3D single task in °/s | 0.21 (0.11–0.35) | 0.26 (0.08–1.01) | 1,264 (< 0.0001) |
| MSV3D motor challenge in °/s | 0.30 (0.11–0.51) | 0.44 (0.16–1.89) | 1,045 (< 0.0001) |
| MSV3D cognitive challenge in °/s | 0.25 (0.07–1.13) | 0.41 (0.12–3.98) | 1,576 (0.001) |
| MSV3D combined task in °/s | 0.29 (0.11–1.25) | 0.45 (0.10–2.31) | 1,315 (< 0.0001) |
| Cognitive feature | |||
| Complete calculation steps | 22 (13–39) | 20 (3–36) | 1,878 (0.046) |
| Calculation steps EO | 12 (5–21) | 10 (1–21) | 1,690 (0.006) |
| Calculation steps EC | 10 (4–18) | 9 (2–17) | 2,036.5 (0.174) |
* Statistical tests for group comparison: Mann-Whitney U test (Mann-Whitney U value). EC: eyes closed; EO: eyes open; HC: healthy controls; MSV3D: Mean angular Sway Velocity in 3D; pwMS: persons with multiple sclerosis
