Table 3. Correlations between Q angle, Chippaux-Smirak Index, Arch Index and foot position angle and Fourier Index 56 and Stability Index in eight different positions.

	Q angle	CSI	Arch index	FPA
Fall Index	0.461**	0.310**	-0.371**	-0.294*
Eyes open
Fourier Index 56	0,164	0,061	-0,090	-0,087
Stability Index	0,179	0,051	-0,134	-0,103
Eyes close
Fourier Index 56	0.460**	0,180	-0,183	-0,131
Stability Index	0.451**	0,171	-0,149	-0,136
Pillow under the feet and eyes open
Fourier Index 56	0.403**	0,188	-0,124	-0,088
Stability Index	0.439**	0,171	-0,136	-0,100
Pillow under the feet and eyes close
Fourier Index 56	0.407**	0,115	-0,110	-0,081
Stability Index	0.355*	0,149	-0,096	-0,083
Head turned to the right and eyes close
Fourier Index 56	0.318*	0,171	-0,143	-0,059
Stability Index	0.342*	0,176	-0,167	-0,078
Head turned to the left and eyes close
Fourier Index 56	0.350*	0.257*	-0,075	-0,001
Stability Index	0.361*	0.245*	-0,097	-0,023
Head turned to the upside and eyes close
Fourier Index 56	0.286*	0,176	-0,061	-0,095
Stability Index	0.370**	0.245*	-0,074	-0,105
Head turned to the downside and eyes close
Fourier Index 56	0.361*	0.252*	-0,199	-0,980
Stability Index	0.374**	0.248*	-0,201	-0,100
SD: Standard deviation; CSI: Chippaux-Smirak Index; FPA: Foot position angle; * p<0.05; ** p<0.001.