Table 2. The mean frequency (SD) of power spectral density of accelerations (PSDA) in three different directions during different standing conditions.

Standing	Eyes-Open	Eyes-Open	Eye-Closed	Eyes-Closed
Groups	Control	OT	Control	OT
Mean frequency of PSDA in Vertical Direction (Hz)	6.82(1.17)	5.18(0.87)*	7.15(1.83)!	11.29(2.78)*!
Mean frequency of PSDA in Anterior-Posterior Direction (Hz)	7.75(1.05)	4.98(0.59)*	8.15(1.49)	11.38(2.27)*!
Mean frequency of PSDA in Medial-lateral Direction (Hz)	7.74(1.32)	5.75(1.24)*	8.53(1.15)	10.65(2.11)*!

*:represents significant differences between patients with OT and Controls.

!: represents differences between Eyes-Open and Eyes-Closed.