Table 3.

Pearsons product-moment correlation coefficients between the column ‘regression value’ and changes in clinical pain scores in Table 2. For VAS and BPI pain the negative correlation coefficient indicates that a high value for regression (high degree of alteration in the EEG) results in a high reduction of pain after treatment

Treatment	VAS	BPI, pain	BPI, interference	QL
Pregabalin	−0.618*	−0.671*	−0.332	0.406
Placebo	−0.190	−0.279	0.112	0.499

^*P < 0.05. VAS, visual analogue scale; BPI, brief pain inventory-short form; QL, quality of life.