Table 1.

Outcome Measures

Outcome Measure	Control Mean ± SD	CAI Mean ± SD
Center-of-pressure area, cm2
Eyes open	6.49 ± 2.83	6.69 ± 3.03
Eyes closed	25.20 ± 7.26	28.46 ±10.66
Center-of-pressure mean velocity, m/s
Mediolateral, eyes open	0.99 ± 0.28	1.01 ±0.26
Anteroposterior, eyes open	0.81 ± 0.22	0.87 ± 0.26
Mediolateral, eyes closed	2.05 ± 0.41	2.21 ± 0.50
Anteroposterior, eyes closed	1.92 ± 0.58	2.08 ± 0.64
SD of center of pressure, cm2
Mediolateral, eyes open	0.19 ± 0.04	0.20 ± 0.04
Anteroposterior, eyes open	0.26 ± 0.06	0.28 ± 0.08
Mediolateral, eyes closed	0.42 ± 0.06	0.45 ± 0.08
Anteroposterior, eyes closed	0.48 ± 0.11	0.53 ±0.13
Center-of-pressure range, cm
Mediolateral, eyes open	0.91 ± 0.17	0.94 ±0.18
Anteroposterior, eyes open	1.22 ± 0.28	1.30 ±0.37
Mediolateral, eyes closed	1.67 ±0.18	1.75 ±0.27
Anteroposterior, eyes closed	2.41 ± 0.56	2.63 ± 0.68
Range of center of pressure used, %
Mediolateral, eyes open	9.50 ± 1.76	10.09 ± 2.01
Anteroposterior, eyes open	4.85 ± 1.11	5.17 ± 1.50
Mediolateral, eyes closed	17.41 ± 1.88	18.74 ± 2.65
Anteroposterior, eyes closed	9.60 ± 2.16	10.50 ± 2.72
Time-to-boundary absolute minimum, s
Mediolateral, eyes open	1.08 ± 0.27	1.10 ± 0.29
Anteroposterior, eyes open	3.67 ± 1.00	3.58 ± 1.17
Mediolateral, eyes closed	0.52 ± 0.09	0.49 ± 0.11
Anteroposterior, eyes closed	1.58 ± 0.51	1.46 ± 0.50
Time-to-boundary mean minimum, s
Mediolateral, eyes open	4.02 ± 1.38	4.10±1.31
Anteroposterior, eyes open	12.24 ± 3.59	12.26 ± 3.46
Mediolateral, eyes closed	1.97 ± 0.54	1.86 ± 0.51
Anteroposterior, eyes closed	5.35 ± 1.64	4.95 ± 1.40
SD of time-to-boundary minimum, s
Mediolateral, eyes open	3.16 ± 1.68	3.08 ± 1.25
Anteroposterior, eyes open	7.76 ± 2.70	8.03 ± 2.50
Mediolateral, eyes closed	1.75 ± 0.68	1.70 ± 0.73
Anteroposterior, eyes closed	3.35 ± 1.19	3.08 ± 0.92

Abbreviation: CAI, chronic ankle instability