Acute nerve stretch and the compound motor action potential

Table 4 Various linear models to predict stretch injury from the outcome variables

Comparison Stages	Normalized Peak-Peak Amplitude	Normalized AUC	Normalized Velocity	Normalized Duration	Best Classification	Classifier For Compression Stage
1-2	Yes	Yes	Yes	Yes	87% (96,77)	VEL-0.33DUR < 0.62
	Yes	Yes	No	No	63% (81,46)	AUC < 0.94
	Yes	No	No	No	63% (77,50)	AMP < 0.94
	No	Yes	No	No	64% (95,75)	AUC < 0.95
	No	No	Yes	No	85% (82,46)	VEL < 0.96
	No	No	No	Yes	63% (76,49)	DUR > 1.02
1-4	Yes	Yes	Yes	Yes	84% (96,71)	-0.25AMP+VEL +0.45AUC-0.75DUR < 0.35
	Yes	Yes	No	No	67% (85,49)	-0.65AMP+AUC < 0.26
	Yes	No	No	No	67% (98,32)	AMP > 1.2
	No	Yes	No	No	65% (97,70)	AUC < .90
	No	No	Yes	No	84% (92,37)	VEL < .95
	No	No	No	Yes	72% (88,54)	DUR > 1.04
1-6	Yes	Yes	Yes	Yes	93% (100,81)	-0.074AMP+VEL+ 0.24AUC+0.23DUR < 0.97
	Yes	Yes	No	No	79% (97,48)	-0.33AMP+AUC < 0.52
	Yes	No	No	No	63% (100,0)	----
	No	Yes	No	No	65% (100,82)	AUC < .74
	No	No	Yes	No	93% (98,31)	VEL < .85
	No	No	No	Yes	70% (99,17)	DUR < .86
1-8	Yes	Yes	Yes	Yes	96% (100,84)	0.48AMP+VEL+ 0.74AUC-0.98*DUR < 0.68
	Yes	Yes	No	No	96% (100,93)	0.66AMP+AUC < 0.95
	Yes	No	No	No	96% (100,93)	AMP < .30
	No	Yes	No	No	95% (100,61)	AUC < .59
	No	No	Yes	No	89% (99.8,92)	VEL < .75
	No	No	No	Yes	81% (100,32)	DUR < .82

VEL is the normalized velocity, AMP is the normalized peak to peak amplitude, DUR is the normalized duration and AUC is the normalized area under the curve. Under best classification the top number is the total number of correctly classified cases. The two numbers in parentheses below this are the specificity and sensitivity.