Identification of Beck Depression Inventory items related to multiple sclerosis

Area of Science:

• Neuroscience
• Psychiatry
• Clinical Psychology

Background:

• The Beck Depression Inventory (BDI) is widely used to assess depression severity.
• Multiple Sclerosis (MS) can present with symptoms that overlap with depression, potentially confounding BDI scores.
• Distinguishing true depressive symptoms from MS-related symptoms is crucial for accurate diagnosis and treatment.

Purpose of the Study:

• To identify specific items on the Beck Depression Inventory (BDI) that are confounded by symptoms of multiple sclerosis (MS).
• To evaluate the impact of these confounded items on depression assessment in MS patients.
• To propose a modified BDI (BDI-18) for more accurate depression measurement in MS.

Main Methods:

• Comparative analysis of BDI item contributions across three groups: MS patients, major depressive disorder (MDD) patients, and healthy controls.
• Statistical identification of BDI items with significantly higher percentage contributions in the MS group compared to MDD and control groups.
• Development and evaluation of an 18-item BDI (BDI-18) by excluding identified confounded items.

Main Results:

• Items related to work difficulty, fatigue, and health concerns were significantly confounded by MS symptoms.
• These confounded items accounted for a substantial portion of the total BDI score in MS patients (34%).
• The modified BDI-18 indicated that MS patients exhibit more depression than controls but less than MDD patients.

Conclusions:

• Specific BDI items are influenced by MS, necessitating careful interpretation of depression scores in this population.
• The 18-item BDI (BDI-18), excluding confounded items, offers a more precise assessment of depression in MS.
• Further research should focus on identifying non-confounded depression indicators for MS patients.