Average (±SD) Absolute Displacement (Rotation [Pitch, Yaw, Roll] and Translation [Δx, Δy, Δz]) of Reference Markers for Subjects in Groups A–D
| Parameter | Group | ||||||
|---|---|---|---|---|---|---|---|
| A | B | C | D | ||||
| Rotation (degrees) | |||||||
| Pitch | 0.8 ± 0.5 | 0.3 ± 0.1 | (0.6 ± 0.4) | 0.3 ± 0.3 | |||
| Yaw | 1.1 ± 0.8 | (0.6 ± 0.6) | (1.2 ± 0.6) | (0.5 ± 0.4) | |||
| Roll | 1.1 ± 0.9 | 0.3 ± 0.3 | 0.2 ± 0.2 | 0.2 ± 0.1 | |||
| 〈rot〉 | 1.0 ± 0.2 | 0.4 ± 0.1 | (0.7 ± 0.5) | 0.3 ± 0.2 | |||
| Translation (mm) | |||||||
| Δx | 4 ± 2 | 1 ± 1 | (4 ± 2) | 0.4 ± 0.3 | |||
| Δy | 4 ± 3 | 1 ± 1 | 1.0 ± 0.8 | 0.6 ± 0.5 | |||
| Δz | 3 ± 1 | (1 ± 1) | (2 ± 1) | 1.1 ± 0.5 | |||
| 〈Δr〉 | 7 ± 3 | 2 ± 2 | (4 ± 2) | 1.4 ± 0.5 | |||
Mean (±SD) of average absolute rotational displacement (<rot>) and mean (±SD) of individual translational displacements Δr (<Δr>) are listed also. Numbers in parentheses indicate no statistically significant difference with respect to group A for Student t test (2-tailed, P < 0.05).