Table 3.

Log-rank (Mantel-Cox) pairwise comparisons in different categories of decreased CMAP amplitude.

	Normal		Mild		Moderate		Severe
	χ2	p	χ2	p	χ2	p	χ2	p
Normal			1.183	0.277	4.790	0.029a	15.109	0.000b
Mild	1.183	0.277			0.967	0.325	6.465	0.011a
Moderate	4.790	0.029a	0.967	0.325			1.364	0.243
Severe	15.109	0.000b	6.465	0.011a	1.364	0.243

^ap ≤ 0.05,

^bp ≤ 0.01.