Table 2 | Summary of the COP-related..

Types of measure	Outcome measures	Description	Interpretation
Time-domain distance measures	MDIST (mm)^a	Average distance from the mean COP	Indicators of stability performance
	RDIST (mm)^a	RMS distance
	TOTEX (mm)^a	Total length of the COP path
	RANGE (mm)^a	Maximum distance between any two points
	MVELO (mm/s)^a	Average velocity of the COP	Indicators of control demand
Time-domain area measures	AREA-CC (mm2)	95% confidence circle area	Indicators of stability performance
Time-domain area measures	AREA-CE (mm2)	95% confidence ellipse area	Indicators of stability performance
Time-domain hybrid measures	AREA-SW (mm2/s)	Sway area	Indicators of the relationship between control demand and stability performance
	MFREQ (Hz)^a	Mean frequency
	FD-RD	Fractal dimension
	FD-CC	Fractal dimension based on the area-CC
	FD-CE	Fractal dimension based on the area-CE
Frequency domain measures	T POWER^a	Total power frequency	Indicators of postural regulations
	50% (Hz)^a	Median power frequency
	95% (Hz)^a	95% power frequency
	CFREQ (Hz)^a	Centroidal frequency
	FREQD^a	Frequency dispersion	Indicators of trunk stiffness

^aComputed based on resultant distance (RD) time series as well as anteroposterior (AP) and mediolateral (ML) time series.

Table 2: Summary of the COP-related outcome measures.

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