Table 4. Percentage of patients with at least one abnormal CSA, ΔCSA or ΔUtpt measurement and those with all nerve measurements within the range of normality grouped according to the WHO operational classification and according to the presence or absence of reactions.

		PB	MB	p-value	No reaction	Previous reactions	p-value
CSA	At least one abnormal measurement	72.7%	69.4%	1.000	63.8%	85.2%	0.0409*
	Normal	27.3%	30.6%		36.2%	14.8%
ΔCSA	At least one abnormal measurement	72.7%	69.4%	1.000	65.2%	81.5%	0.1433
	Normal	27.3%	30.6%		34.8%	18.5%
ΔUtpt	At least one abnormal measurement	45.5%	40%	0.7534	36.8%	51.8%	0.2476
	Normal	54.5%	60%		63.2%	48.2%

Values were considered abnormal when they exceeded the mean + 2SD value obtained from healthy volunteers.

p-value by two-tailed Fisher’s test.

* Statistically significant.