Assessment of C Fibers Evoked Potentials in Healthy Subjects by Nd : YAP Laser

Table 3

Values of latencies and amplitudes of N2P2 components for the a-delta and C modalities of stimulation in 20 healthy subjects. Results of statistical analysis are reported.

		Stimulation type	N	Mean	SD	Error ds	Student’s t test		Leven test (F)
Face	N2 latency (msec)	Ad	20	161.00	19.167	4.286	−6.95	<0.001	15.77	<0.001
		C	18	283.52	76.283	17.980
	P2 latency (msec)	Ad	20	330.08	51.120	11.431	−6.76	<0.001	6.61	0.014
		C	18	493.51	93.751	22.097
	N2 amplitude (uV)	Ad	20	−17.14	9.81	2.19	4.96	<0.001	9.21	0.004
		C	18	−5.42	2.09	0.49
	P2 amplitude (uV)	Ad	20	9.31	5.15	1.15	6.61	<0.001	6.61	0.014
		C	18	3.78	2.76	0.65
Hand	N2 latency (msec)	Ad	20	228.33	57.90	13.28	3.23	0.001	21.72	<0.001
		C	16	455.42	276.14	69.03
	P2 latency (msec)	Ad	20	345.31	34.05	7.81	−8.37	<0.001	35.74	<0.001
		C	16	1062.84	355.73	88.93
	N2 amplitude (uV)	Ad	20	−17.04	11.13	2.55	−3.54	<0.001	6.59	0.02
		C	16	−7.18	4.37	1.09
	P2 amplitude (uV)	Ad	20	10.95	5.71	1.31	2.04	0.025	0.29	0.58
		C	16	7.26	4.89	1.22
Knee	N2 latency (msec)	Ad	20	206.64	22.76	5.09	−7	<0.001	30.83	<0.001
		C	17	1026.84	431.91	104.75
	P2 latency (msec)	Ad	20	374.22	36.28	8.11	11.89	<0.001	29.55	<0.001
		C	17	1319.12	325.91	79.05
	N2 amplitude (uV)	Ad	20	−14.83	9.36	2.09	-3.11	0.002	8.37	0.007
		C	17	−7.33	4.92	1.19
	P2 amplitude (uV)	Ad	20	8.10	5.42	1.21	1.75	0.045	7.97	0.008
		C	17	5.76	2.31	0.56
Foot	N2 latency (msec)	Ad	20	243.36	27.47	6.14	−12.34	<0.001	21.85	<0.001
		C	17	1048.44	267.77	64.94
	P2 latency (msec)	Ad	20	400.20	82.64	18.48	−13.16	<0.001	18.37	<0.001
		C	17	1348.52	287.01	69.61
	N2 amplitude (uV)	Ad	20	−14.06	9.00	2.01	−2.88	0.006	2.05	0.61
		C	17	−6.91	5.22	1.27
	P2 amplitude (uV)	Ad	20	9.75	4.68	1.05	2.76	0.006	0.12	0.72
		C	17	5.95	3.85	0.93