Table 1.

Mean (SD) of the postural stability parameters in the soccer players and controls in both planes and both visual conditions

	Eyes open			Eyes closed
	Athletes	Controls	p	Athletes	Controls	p
Medial/lateral plane
Variability (mm)	3.0 (1.4)	4.1 (2.2)	0.04	2.5 (0.9)	4.1 (1.8)	0.0003
Range (mm)	15.6 (10.2)	22.8 (17.0)	0.05	12.7 (4.8)	21.9 (10.3)	0.0003
Mean velocity (mm/s)	6.1 (2.9)	10.5 (3.2)	0.0001	5.7 (1.9)	10.9 (4.7)	0.0001
Frequency (Hz)	0.33 (0.07)	0.47 (0.10)	0.001	0.37 (0.11)	0.44 (0.12)	0.04
Anterior/posterior plane
Variability (mm)	3.2 (1.1)	3.9 (1.5)	0.07	3.4 (1.4)	4.0 (1.3)	n/s
Range (mm)	15.6 (7.2)	18.5 (6.3)	n/s	16.1 (5.6)	20.5 (6.9)	0.02
Mean velocity (mm/s)	6.6 (2.9)	8.0 (2.5)	0.04	7.5 (2.1)	9.4 (3.3)	0.03
Frequency (Hz)	0.34 (0.09)	0.36 (0.12)	n/s	0.39 (0.14)	0.39 (0.14)	n/s

The p values are significance levels of the between-group differences resulting from planned comparisons

n/s non-significant