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Objectiveto examine the longitudinal effect of depression on glycemic control in a sample of patients with type 2 diabetes.Methodsthe patients were recruited from diabetes clinic in Saudi airlines medical center, in Jeddah, the base line study community consisted from 172 patients with type 2 diabetes. They were assessed for depression using BDI II, and diagnostic interview, and for diabetic control using HbA1c. We created a person-period data set for each patient to cover 6 months intervals up to 3 years. We used generalized estimation equation (GEE) for analysis of longitudinal data. HbA1C was the response variable while depression and time were the main covariates. Variables were included in GEE models based on clinical importance and preliminary analysis. Other variables included as covariates were gender, education, duration of diabetes, co-morbidity and LDL. All statistical analysis used α = 0.05 level of significance and were performed using SPSS software version 21.ResultsUnadjusted HbA1c means were significantly higher in depressed vs. non-depressed subjects at all time points. The adjusted HbA1c means in final GEE model were significantly higher in depressed vs. non-depressed subjects. In all adjusted models depression was a predictor of glycemic control weather it was BDI score (estimate = .049, P = .002), diagnoses of MDD (estimate = 2.038, P = .000), or other depressive diagnosis (estimate = 1.245, P = .000).ConclusionThis study on clinical sample of type 2 diabetic patients demonstrates that there is a significant longitudinal relationship between depression and glycemic control and that depression is associated with persistently higher HbA1c over time.Disclosure of interestThe authors have not supplied their declaration of competing interest.

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Background Studies had confirmed that diabetic patients have a greater risk for developing depression. Our objectives were to estimate the prevalence and predictors of depression among type 2 diabetic patients. Methods A cross-sectional study at the Diabetic Center, Armed Forces Hospital-Southern Region (AFHSR), Khamis Mushait was conducted in the period from March to June 2017. The study includes a convenience sample of type 2 diabetic patients. Self-administered questionnaires were utilized. It consists of personal characteristics, diabetes-related information’s, and the Arabic version of the Patient Health Questionnaire (PHQ-9). Proper statistical analyses were done to assess the significance of the correlates with p ≤ 0.05 considered significant. Results The study included 350 diabetic patients out of 410 with a response rate of 85.4%. Their age ranged between 28 and 100 years with a mean ±SD of 61.4±13 years. The prevalence of depression among them was 36.6%. Logistic regression revealed that patients older than 50 years were at lower risk for developing depression as compared to those aged between 28 and 40 years OR and 95% CI were 0.21 (0.08–0.57), 0.30 (0.12–0.78) and 0.33 (0.12–0.91) for patients in the age groups 51–60, 61–70 and > 70 years, respectively. Diabetic patients with thyroid dysfunction, neuropathy, those treated with insulin, and noncompliant patients were at double risk for developing depression compared to their counterparts (OR = 2.26, 95% CI = 1.20–4.27, p = 0.012); (OR = 2.35, 95% CI = 1.22–4.53, p = 0.011); (OR = 1.92, 95% CI = 1.08–3.40, p = 0.026); (AOR = 2.14, 95% CI = 1.01–4.53, p = 0.047) respectively. Conclusion Almost one third of type 2 diabetic patients were depressed. Younger patients, having comorbid thyroid disorders or neuropathy, those treated with insulin and noncompliant patients were at higher risk for developing depression. Proper screening and treatment of depression is a crucial part of the health care management of diabetic people.