Demographic and Clinical Factors Associated with Depression in 140 Hospitalized Diabetic Patients with Distal Symmetric Polyneuropathy Evaluated Using Beck Depression Inventory and 6-Item Neuropathy Total Symptom Score Questionnaire

BACKGROUND: Diabetic distal symmetric polyneuropathy (DSPN) is one of the most common and costliest long-term complications. The pain and function limitations may lead to depression. This study aimed to assess the influence of demographic and clinical factors on the prevalence of depression among diabetic patients with distal symmetric polyneuropathy (DSPN). MATERIAL/METHODS: A total of 140 patients with diabetic DSPN completed the 21-item Beck Depression Inventory (BDI) measuring characteristic attitudes and symptoms of depression. The intensity of neuropathic complaints was assessed using the Neuropathy Total Symptom Score-6 items (NTSS-6). Testing for peripheral neuropathy was performed. All patients completed questionnaires, which included anthropometric measures, social parameters, and medical aspects. Statistical analyses were done using STATISTICA 8 PL software. RESULTS: Statistically significant relationships were found between the depression symptoms in diabetic patients and the intensity of subjective neuropathy symptoms evaluated by NTSS-6, body mass index (BMI), and education level. On average, each 1-point increase in NTSS-6 predicted a 16% increase in the risk of depression. Each 1 kg/m(2) increase in the BMI was associated with a 10% increase of depression risk. CONCLUSIONS: The study showed the positive quantitative relationship between diabetic DSPN and depression symptoms. The BMI, severity of neuropathy symptoms, and lower level of education had a statistically significant association with the level of depression and may be useful in evaluating the risk of depression among DSPN patients.