Personality-related core beliefs in patients diagnosed with fibromyalgia plus depression: A comparison with depressed and healthy control groups.

Background: Personality has an important role in understanding both fibromyalgia syndrome (FMS) and major depressive disorder (MDD).

Aims: This study considers the question that specific personality features may characterize depressed FMS patients.

Materials And Methods: To this end, 125 individuals were included in the study: 40 of them diagnosed with FMS+ MDD, 40 with MDD only and 45 healthy controls. Individual Beck Depression Inventory (BDI) and Personality Belief Questionnaire-Short Form (PBQ-SF) scores were compared between the three groups.

Results: The mean scores for each personality domain of the PBQ-SF were the highest in the MDD group and the lowest mean scores appeared in the control group. Dependent personality and obsessive-compulsive personality scores were higher in the MDD group (t = 2.510, P = 0.014 and t = 2.240, P = 0.028, respectively) in comparison with the FM+ MDD group. However, this difference disappeared when PBQ-SF scores were controlled for depression severity.

Conclusions: Although some common personality features are evident in FMS patients, it seems that the differences identified are primarily related to depression symptom severity.