Danish multicentre study on reference values for sensory evoked potentials

Side differences were found for the following parameters, all with right-sided values larger than left-sided: Latency wrist-elbow: in average 0.07 msec (t-test: t=-2.7, N=61, p=0.0102) Latency wrist-Erbs: in average 0.1 msec (t-test: t=-3.3, N=60, p<0.001) Latency wrist-N14: in average 0.2 msec, (t-test: t=-4.2, N=63, p<0.0001) Latency wrist-N20: in average 0.16 msec, (t-test: t=-3.0, N=61, p<0.001) Distance wrist-Erbs: in average 3.2 mm, (t-test: t=-2.3, N=61, p=0.02) Further calculations on median nerve parameters were performed on right-sided values. Tibial nerve For the parameters P40' and CSCT (P40') side differences were found, left-sided values larger than right-sided: Latency ankle-P40': in average 0.50 msec (t-test: t=3.6, N=65, p<0.001) CSCT (P40'): in average 0.52 msec (t-test: t=3.6, N=56, p<0.001) Further calculations on tibial nerve parameters were performed on left-sided values, except for P40' and CSCT (P40') where values were calculated on both sides. Reference intervals for side-differences are shown in Table 1 for median nerve parameters and in Table 3 for tibial nerve parameters.