Table 2.

Intraclass correlation coefficient (ICC) and standard error of the measurement (SEM) of COP Area and Velocity (Vel) measures from the Balance Rehabilitation Unit (BRU). Both Area and Velocity are measured for all 6 sensory conditions (C1 to C6) in the BRU. ICC and SEM are calculated for all subjects (ALL), young controls (YC), older controls (OC), and individuals with vestibular disorders (V). See text for explanation of sensory conditions.

Sensory Condition	ICC*				SEM
	ALL	YC	OC	V	ALL	YC	OC	V
Area - C1	0.76	0.61	0.70	0.77	0.8	0.5	0.8	1.0
Area - C2	0.84	0.74	0.72	0.83	2.2	0.4	1.2	3.8
Area - C3	0.81	0.76	0.76	0.78	1.7	0.9	0.9	2.6
Area - C4	0.86	0.78	0.85	0.84	1.8	0.5	1.6	2.6
Area - C5	0.84	0.73	0.82	0.83	5.0	1.9	3.3	7.7
Area - C6	0.85	0.76	0.78	0.87	6.4	1.6	3.5	5.3
Vel - C1	0.85	0.67	0.82	0.85	0.3	0.1	0.2	0.4
Vel - C2	0.88	0.62	0.91	0.79	0.6	0.1	0.4	1.0
Vel - C3**	0.87	0.78	0.86	0.83	0.5	0.1	0.2	0.8
Vel - C4	0.89	0.78	0.78	0.89	0.4	0.1	0.4	0.6
Vel - C5	0.89	0.77	0.87	0.86	0.6	0.4	0.4	1.0
Vel - C6	0.90	0.86	0.73	0.93	0.4	0.2	0.5	0.5

^*Area and Velocity values were transformed to natural logarithm to satisfy the assumption of a normal distribution of between-trial error.

^**Failed to demonstrate normal distribution of error values after transformation.