Table 2. Stability index score with decreasing platform stability (30 s tests from level 12 to 1. Dynamic test 1).

	Group 1 (n = 19)		Group 2 (n = 11)		p-value (ANOVA)
	L5 low		L5 high
	Mean	SD	Mean	SD
	Eyes open
OSI	1.43	0.35	1.68	0.61	0.02*
APSI	1.05	0.32	1.19	0.54	0.37
MLSI	0,77	0.31	1.16	0.49	0.01*
	Cursor
OSI	0.76	0.2	0.88	0.29	0.19
APSI	0.52	0.15	0.61	0.26	0.24
MLSI	0.44	0.15	0.5	0.12	0.32
	Eyes closed
OSI	3.62	1.14	5	0.84	0.002*
APSI	2.49	0.82	3.52	0.78	0.001*
MLSI	2.16	0.7	2.78	0.58	0.02*

L5: least active 5-h period; OSI: overall stability index; APSI: anteroposterior stability index; MLSI: mediolateral stability index; SD: standard deviation

*statistically significance difference.