The Journal of Korean Physical Therapy

Table. 4.

Table 4

Main and interaction effects of SVV and head orientation on COP parameter in tandem stance

COP parameters	Factors	df	Mean square	F	p
Sway length (mm)	SVV	1	248,017.310	0.434	0.511
	HO	4	631,314.373	1.105	0.358
	SVV×HO	4	75,158.590	0.131	0.971
Ellipse Surface (mm²)	SVV	1	322,127.428	5.348	0.023*
	HO	4	39,877.672	0.662	0.620
	SVV×HO	4	37,587.219	0.624	0.646
Delta X (mm)	SVV	1	48.161	0.513	0.475
	HO	4	88.005	0.938	0.445
	SVV×HO	4	28.924	0.308	0.872
Delta Y (mm)	SVV	1	0.003	<0.001	0.997
	HO	4	469.437	2.379	0.056
	SVV×HO	4	32.249	0.163	0.956
Average speed (mm/s)	SVV	1	906.090	0.289	0.592
	HO	4	3,751.021	1.195	0.317
	SVV×HO	4	883.892	0.281	0.889

SVV: Subjective visual vertical, HO: Head orientation, df: degrees of freedom. *p<0.05.