Table 1.

Group descriptives and Mann–Whitney U independent tests for groups comparison (N = 31).

	Group	Mean	SD	Median	Quartiles	W statistic	p	r effect size
AP
SD (mm)	Students	4.62	2.22	4.09	2.86–5.12	411	0.333	0.12
	Athletes	3.98	1.34	3.94	3.10–4.55
RA (mm)	Students	22.76	7.93	21.30	16.55–25–69	290	0.007	0.34
	Athletes	17.71	4.85	17.79	15.70–20.34
MV (mm/s)	Students	6.65	1.94	6.40	5.22–7.54	292	0.007	− 0.34
	Athletes	7.63	1.51	7.65	6.78–8.14
PF (Hz)	Students	0.59	0.12	0.55	0.53–0.67	229.5	< .001	0.45
	Athletes	0.47	0.12	0.47	0.41–0.54
CF (Hz)	Students	0.26	0.11	0.23	0.17–0.30	275	0.003	− 0.37
	Athletes	0.33	0.11	0.31	0.25–0.40
FD (–)	Students	1.43	0.11	1.41	1.34–1.50	174	< .001	− 0.55
	Athletes	1.58	0.12	1.59	1.49–1.65
ML
SD (mm)	Students	3.05	0.91	2.90	2.35–3.49	438	0.549	0.08
	Athletes	2.94	1.11	2.78	2.10–3.59
RA (mm)	Students	17.39	4.86	17.58	13.78–19.92	323	0.026	0.28
	Athletes	14.64	5.73	14.06	10.78–17.96
MV (mm/s)	Students	5.65	1.57	5.38	4.78–6.58	331	0.035	− 0.27
	Athletes	6.69	1.87	6.19	5.29–8.02
PF (Hz)	Students	0.66	0.14	0.66	0.60–0.74	452	0.695	− 0.05
	Athletes	0.69	0.17	0.68	0.59–0.74
CF (Hz)	Students	0.31	0.10	0.30	0.24–0.39	290	0.007	− 0.34
	Athletes	0.39	0.11	0.37	0.31–0.46
FD (–)	Students	1.46	0.11	1.45	1.39–1.51	158	< .001	− 0.58
	Athletes	1.61	0.11	1.56	1.54–1.67

SD, standard deviation of COP; RA, a range of COP; MV, mean speed of COP; PF, peak frequency of COP-COM; CF, COP frequency; FD, fractal dimension; AP, anterior–posterior plane; ML, medial–lateral plane.