| CI | confidence interval |
| COP | center of pressure |
| DX | distance travelled of COP on the x-axis |
| DY | distance travelled of COP on the y-axis |
| Kg | kilograms |
| ICC | intraclass correlation coefficient |
| OE | open eyes |
| SD | standard deviation |
| Xm | mean displacement in the x-axis |
| Ym | mean displacement in the y-axis |
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