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Table 1 Description of the 6-point graded EP ordinal scale

From: Multimodal evoked potentials for functional quantification and prognosis in multiple sclerosis

EP results (MEP, SEP, VEP) Score
Normal (ampl and lat) 0
Pathological body side difference lat 1
Pathological body side difference ampl or pathological lat but < P33.3 2
P33.3 < lat < P66.7 or increased duration of the cortical stimulation induced response (MEP) 3
P66.7 < lat 4
Pathological ampl and normal duration of the cortical stimulation induced response (MEP) 5
  1. EP evoked potentials, MEP motor evoked potentials, SEP somatosensory evoked potentials, VEP visual evoked potentials, Ampl amplitude, Lat latency, P33.3, first tertile, derived from the MS sample presenting a pathological latency; P66.7, second tertile, derived from the MS sample presenting a pathological latency; MEP, motor evoked potentials