Is there any specific personality disorder or personality disorder cluster that worsens the short-term treatment outcome of major depression?

This study attempted to identify a specific personality disorder (PD) or PD cluster that independently worsens the 4-month treatment outcome of major depression under adequate antidepressant. The material of the study was 96 consecutive outpatients with major depression. For the Axis I and Axis II diagnoses, the Structured Clinical Interview for DSM-III-R (SCID) was used. In the material, the presence of any PD significantly worsened the 4-month outcome. The discriminant function analysis, conducted to identify a specific PD or PD cluster that influences the outcome, found that the number of PD from only cluster A and the number of criteria met for only schizoid PD was significantly correlated with the 4-month outcome of depression.