Pain Processing and Vegetative Dysfunction in Fibromyalgia: A Study by Sympathetic Skin Response and Laser Evoked Potentials

Table 2

Mean and standard deviations of LEP latencies in control subjects and fibromyalgia (FM) patients. The LEPs from the hand and the foot were absent in 5 patients, while 2 patients did not show clear LEPs from the only foot site. The results of Student’s -test for unpaired data are reported.

Diagnosis	N1 hand	N2 hand	P2 hand	N1 foot	N2 foot	p2 foot
Controls
Mean	172.83	224.43	263.2	186.63	258.26	292.13
SD	9.84	9.07	18.74	8.79	11.93	15.96
N°	30	30	30	30	30	30
Fibromyalgia
Mean	177.88	227.61	297.4	192.9	258.66	325.73
SD	27.44	28.70	44.32	34.55	31.93	43.42
N°	45	45	45	43	43	43
Student’s -test
	−1.12	−0.7	−4.68	−1.05	−0.76	−4.73
	n.s.	n.s.	<0.0001	n.s.	n.s.	<0.0001