Table 1.

Equations for calculating the difference between and the variability of peripheral nerve CSAs.

Variable	Approach	Equation
Asymmetry	Ratio	= [maximum CSA (right/left)] − [minimum CSA (right/left)]
	Difference	ΔMT = [maximum CSA MT (right/left)] − [minimum CSA MT (right/left)]
		ΔUT = [maximum CSA UT (right/left)] − [minimum CSA UT (right/left)]
		ΔUPT = [maximum CSA UPT (right/left)] − [minimum CSA UPT (right/left)]
		ΔFH = [maximum CSA FH (right/left)] − [minimum CSA FH (right/left)]
Focality	Ratio	= [maximum CSA (UT/UPT)] − [minimum CSA (UT/UPT)]
	Difference	ΔTPT = [maximum CSA (UT/UPT)] − [minimum CSA (UT/UPT)]