Fig. 2
From: Interictal quantitative EEG in migraine: a blinded controlled study
Larger fronto-central delta power in migraineurs than in controls is observed on the symptomatic side compared to the pain-free side (S − NS difference; Mann–Whitney U test, p = 0.005). S and NS have been selected randomly in the control group. Two outliers are not shown (but included in the statistical analysis)