Correlations between clinical scale scores and brain functional connectivity. (A) At baseline, the correlation between the K-ARS scores and FC from the PCC seed to the right middle frontal gyrus in the ADHD+SOM group (r = −0.58, p = 0.03). (B) At baseline, the correlation between the K-ARS scores and FC from the PCC seed to the right middle frontal gyrus in the ADHD-SOM group (r = −0.61, p = 0.02). (C) At baseline, the correlation between the SCL-90R-SOM scores with FC from the PCC seed to the right middle frontal gyrus in the ADHD+SOM group (r = −0.56, p = 0.03). (D) At baseline, the correlation between the SCL-90R-SOM scores with FC from the PCC seed to the right middle frontal gyrus in the ADHD+SOM group (r = −0.11, p = 0.69). ADHD+SOM, adolescents with attention deficit hyperactivity disorder (ADHD) with somatic symptoms; ADHD-SOM, adolescents with ADHD without somatic symptoms; B K-ARS, baseline Korean version of Dupaul’s ADHD rating scale; B SCL-90R-SOM, baseline symptom checklist-90- revised-somatization subscale; FC Rt. MFC, functional connectivity (FC) from the posterior cingulate cortex (PCC) seed to the right middle frontal gyrus.