Table 3 Relation between disease duration and the percentage of nerves with weakness, axon loss, conduction block, and demyelinative slowing.

Disease duration (years)	No of patients	Percentage of nerves with*
		Weakness	Axon loss	Conduction block	Demyelinative slowing
0–5	4	24	54	5	3
5–10	7	44	55	12	27
10–15	6	60	65	27	42
15–20	3	86	73	27	55

*For each disease duration category, the total number of nerves with abnormalities was assessed and expressed as a percentage of the total number of nerves within that category.