Table 4.

SSEP Responses on Week 5

Displacement	Response rate (%)	P1 onset latency (msec)	P1—N1 amplitude (uV)
0 mm	100	11.6 ± 0.34	55.4 ± 14.0
0.2 mm	100	12.8 ± 0.47	53.8 ± 16.5
0.4 mm	100	13.2 ± 0.90*	55.5 ± 27.5
0.6 mm	66.7***	13.3 ± 0.73*	26.9 ± 6.8*
0.8–1.2 mm	0*** (***)	N/A	N/A

Data are the mean ± SD; n = 5–6/group. For response rate

^***p < 0.001 as compared to 0, 0.2, and 0.4 mm displacement

^(***)p < 0.001 as compared to 0.6 mm displacement. For onset latency

^*p < 0.05 as compared to 0.0 mm displacement; for P1—N1 amplitude, *p < 0.05 compared to all other groups.