On the use of approximate entropy and sample entropy with centre of pressure time-series

Table 4 Linear measures of centre of pressure displacement by group

	Descriptive statistics by group						Post hoc
	Young (Y)		Non-Fallers (NF)		Fallers (F)		NF-Y		F-Y		F-NF
Variable	Mean	SD	Mean	SD	Mean	SD	MD	p-value	MD	p-value	MD	p-value
Total displacement (cm)	110.479	71.097	152.342	96.961	162.718	102.772	41.863	<0.001	52.239	<0.001	10.376	0.266
Standard deviation, AP (cm)	0.730	0.347	0.833	0.434	0.866	0.446	0.103	<0.001	0.136	<0.001	0.033	0.519
Standard deviation, ML (cm)	0.511	0.279	0.639	0.401	0.683	0.440	0.128	<0.001	0.172	<0.001	0.044	0.251
Amplitude, AP (cm)	4.017	2.006	4.810	2.646	5.103	2.684	0.793	<0.001	1.086	<0.001	0.293	0.247
Amplitude, ML (cm)	2.930	1.669	3.663	2.357	3.889	2.575	0.733	<0.001	0.959	<0.001	0.226	0.337
Total Mean Velocity, (cm/s)	1.841	1.185	2.539	1.616	2.712	1.713	0.698	<0.001	0.871	<0.001	0.173	0.266
Mean Velocity, AP (cm)	1.313	0.862	1.928	1.212	2.118	1.343	0.615	<0.001	0.805	<0.001	0.190	0.058
Mean Velocity, ML (cm)	1.013	0.668	1.261	0.864	1.273	0.846	0.248	<0.001	0.260	<0.001	0.012	0.981
Area (cm2)	8.270	7.481	12.71	13.015	14.25	14.326	4.440	<0.001	5.980	<0.001	1.540	0.155

SD standard deviation, MD mean difference, AP anterior-posterior, ML medial-lateral
Bold values indicate significant differences

ISSN: 1743-0003