The Journal of Korean Physical Therapy

Table. 3.

Table 3

Main and interaction effects of SVV and head orientation on COP parameters in upright stance

COP parameters	Factors	df	Mean square	F	p
Sway length (mm)	SVV	1	360,874.152	8.714	0.004*
	HO	4	61,377.685	1.482	0.212
	SVV×HO	4	37,323.638	0.901	0.466
Ellipse Surface (mm²)	SVV	1	29,408.469	31.173	<0.001*
	HO	4	457.089	0.485	0.747
	SVV×HO	4	353.590	0.375	0.826
Delta X (mm)	SVV	1	100.952	16.948	<0.001*
	HO	4	5.940	0.997	0.412
	SVV×HO	4	0.861	0.145	0.965
Delta Y (mm)	SVV	1	340.473	13.538	<0.001*
	HO	4	47.745	1.898	0.115
	SVV×HO	4	11.988	0.477	0.753
Average speed (mm/s)	SVV	1	1,741.463	8.054	0.005*
	HO	4	351.120	1.624	0.173
	SVV×HO	4	187.380	0.867	0.486

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