at the edge of significancep = 0.053
The global power spectrum computed within the low (Lβ, 13–20 Hz) and the high (Hβ, 20–30 Hz) β frequency sub-bands was significantly lower in patients than in controls, and accordingly, Lβ was negatively correlated to the pain visual analog scale ( R = −0.931, p = 0.007), whereas Hβ correlation was at the edge of significance ( R = −0.805; p = 0.053).