Table 7 Predictive value of evoked potential global score at basal examination on Expanded Disability Status Scale (EDSS) progression at follow‐up, defined as an increase of at least 1 (if baseline EDSS <5.5) and of at least 0.5 (if baseline EDSS ⩾5.5).

	EP >13	EP ⩽13	Total	PV
EDSS+	29	16	45	0.725
EDSS−	11	28	39	0.636
Total	40	44	84

EDSS, Expanded Disability Status Scale; EP, evoked potential; PV, predictive value.

The EP global score was categorised into two groups according to the median value: ⩽13 (less involved EP) and >13 (more involved EP). χ² analysis: p = 0.001; odds ratio = 4.6 (1.8–11.6).