Table 3.
Movement | Task | Plane | Controls |
CD |
||
---|---|---|---|---|---|---|
Mean | SD | Mean | SD | |||
Translation (mm) | Rest | x | 0.08 | 0.07 | 0.12 | 0.10 |
y | 0.11 | 0.12 | 0.16 | 0.15 | ||
z | 0.33 | 0.31 | 0.36 | 0.24 | ||
Hand | x | 0.08 | 0.06 | 0.15 | 0.15 | |
y | 0.11 | 0.11 | 0.17 | 0.16 | ||
z | 0.32 | 0.30 | 0.46 | 0.32 | ||
Head | x | 0.10 | 0.08 | 0.13 | 0.10 | |
y | 0.13 | 0.14 | 0.17 | 0.15 | ||
z | 0.37 | 0.33 | 0.38 | 0.26 | ||
Rotation (mm) | Rest | x | 0.28 | 0.26 | 0.40 | 0.34 |
y | 0.16 | 0.17 | 0.19 | 0.17 | ||
z | 0.21 | 0.17 | 0.34 | 0.29 | ||
Hand | x | 0.26 | 0.23 | 0.44 | 0.35 | |
y | 0.15 | 0.14 | 0.23 | 0.20 | ||
z | 0.21 | 0.16 | 0.42 | 0.37 | ||
Head | x | 0.31 | 0.31 | 0.39 | 0.31 | |
y | 0.19 | 0.17 | 0.19 | 0.17 | ||
z | 0.24 | 0.18 | 0.39 | 0.34 |
A three-way MANOVA (task × plane × group) was conducted to analyze translational and rotational head movements. There was a significant main effect for group on both translation (F = 744) and rotation (F = 2173), suggesting the CD group moved more than the control group overall. However, the actual magnitude of the difference was small and well below the 1.75 cutoff. There was a significant main effect for task on both translation (F = 140) and rotation (F = 128), suggesting one task was associated with greater motion. Post hoc analyses indicated that head tasks showed significantly more head motion than rest (p = 0.00) and hand tasks (p = 0.00). There was a significant main effect of plane on both translation (F = 8026) and rotation (F = 1644). Post hoc analyses indicated that z translation showed significantly more head motion than x (p = 0.00) and y translation (p = 0.00). For rotational movements, post hoc analyses indicated that rotation in the x plane showed significantly more head motion than the y (p = 0.00) and z (p = 0.00) planes.
CD, cervical dystonia.