Table 4 Logistic regression analysis for the determinants of weakness.

Determinant	Univariate	p Value	Multivariate	p Value
Axon loss	5.7 (2.9 to 11.1)	<0.001	4.4 (2.0 to 9.7)	<0.001
Conduction block	7.1 (2.6 to 19.4)	<0.001	2.1 (0.7 to 6.6)	NS
Demyelinative slowing	6.6 (3.1 to 14.0)	<0.001	2.0 (0.8 to 4.8)	NS
Years untreated	1.1 (1.1 to 1.2)	<0.001	1.1 (1.0 to 1.2)	<0.01
Years treated	1.0 (0.9 to 1.2)	NS	1.1 (0.9 to 1.3)	NS
Nerve length	2.1 (1.4 to 3.1)	<0.001	1.9 (1.1 to 3.2)	<0.05

Data are expressed as odds ratio (95% confidence interval).

NS, not significant.