Fig. 4. Changes in global K* values vs. changes in OCD symptom severity.

Pre–post treatment changes in global K* values (ΔK*_global) correlated positively with % decrease in Y-BOCS scores (r_s = 0.46, p = 0.08). Notably, there was a clear outlier in this correlation (with the outlier removed, r_s = 0.67, p = 0.009); the outlier (red circle) was not included in the least-squares linear fit to the data shown here. Patients treated with sertraline are represented by triangles, and patients treated with CBT are represented by circles. The ΔY-BOCS score cut-off for responder/partial responder and non-responder subgroups is indicated with the dashed vertical line. Y-BOCS Yale-Brown Obsessive-Compulsive Scale, r_s Spearman’s rank correlation coefficient