Table 1.
Three-way ANOVA between the three balance factors (stance, vision, and surface)
| Balance factor | Average ± SD
|
Significance (P-value for main effect)
|
|||
|---|---|---|---|---|---|
| RMS (m/s2) | Centroid frequency (Hz) | RMS | Centroid frequency | ||
| Stance | Two feet | 0.08±0.07 | 50.2±9.1 | P<0.001 | P<0.001 |
| Tandem | 0.34±0.41 | 36.2±10.5 | |||
| Vision | Eyes-open | 0.09±0.06 | 48.2±9.2 | P<0.001 | P<0.001 |
| Eyes-closed | 0.33±0.42 | 38.2±12.6 | |||
| Surface | Firm | 0.08±0.08 | 50.0±8.7 | P<0.001 | P<0.001 |
| Foam | 0.34±0.41 | 36.4±11.1 | |||
Notes: Significant main effects for three-way ANOVA across balance factors. Significant two-way interactions (P=0.003) between the factors (stance, vision, and surface) and three-way interactions (P=0.006) were also detected.
Abbreviations: ANOVA, analysis of variance; SD, standard deviation; RMS, root-mean-square.