Correlation between evoked potential amplitude and pain score. (a) Correlation of amplitude and pain score data for all baseline and fMRI sessions (n = 40) revealed a significant positive relationship (rs = 0.5956, p < 0.0001). (b) A significant, positive correlation (rs = 0.7697, p = 0.0063) was also seen when the baseline and fMRI data was pooled to give an overall evoked potential amplitude and VAS score for each subject (n = 10).
Roberts et al. BMC Anesthesiology 2008 8:8 doi:10.1186/1471-2253-8-8