Longitudinal effects of depression on glycemic control in veterans with Type 2 diabetes
Abstract
Objectives To examine the longitudinal effects of depression on glycemic control in veterans with Type 2 diabetes.Methods Data on 11,525 veterans with Type 2 diabetes were analyzed. A person-period dataset for each subject to cover 3-month intervals (36 time intervals) from April 1997 to March 2006 was created. Subjects were classified as depressed based on ICD-9 codes for depression. General linear mixed model regression was used to examine changes over time in HbA(1c) levels and whether the changes from baseline were different in depressed and nondepressed diabetic veterans, sequentially adjusting for baseline age, demographic variables and comorbidities (coronary heart disease, stroke and hypertension). Pooled t-tests were used to compare unadjusted mean HbA(1c) at each time point across the depressed and nondepressed groups. SAS was used for statistical analysis.Results Ninety-seven percent were men, 48% were white, 27% were blacks and 25% were other. Mean age was 66 years and mean follow-up period was 4.1 years. Six percent (696/11,525) of the sample had diagnosed depression. Unadjusted mean HbA(1c) values were significantly higher in depressed vs. nondepressed subjects at all time points. The adjusted mean HbA(1c) values over time in the final mixed model were significantly higher in depressed vs. nondepressed subjects (mean difference of 0.13; 95% CI [0.03; 0.22]; P=.008). In all adjusted models, differences in mean HbA(1c) values were significantly higher in depressed vs. nondepressed subjects with Type 2 diabetes.Conclusion This study of veterans with Type 2 diabetes demonstrates that there is a significant longitudinal relationship between depression and glycemic control as measured by HbA(1c) and that depression is associated with persistently higher HbA(1c) levels over time.
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Comorbid MDD in people with type 2 diabetes is associated with reduced glycemic control.
“Comorbid MDD in people with type 2 diabetes is associated with poorer adherence to diabetes treatment52 and self-care activities (e.g., exercise, healthy eating)53,54, increased health care costs22,54, reduced glycemic control55,56, and increased hospital admissions and complications57-60.”
From Comorbidity between major depressive disorder and physical diseases: a comprehensive review of epidemiology, mechanisms and management (2023) · cites this paper as [55]
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- Authors
- Richardson, L. K., Egede, L. E., Mueller, M., Echols, C. L., & Gebregziabher, M.
- Affiliations
- Medical University of South Carolina (US)
- Corresponding author
- Egede, Leonard E.
- Venue
- General Hospital Psychiatry
- Publisher
- Elsevier BV
- Published
- 2008-11
- Volume
- 30
- Issue
- 6
- Pages
- 509-514
- ISSN
- 0163-8343 (ISSN-L)
- OpenAlex
- W1978789286
- Cited by
- 162
- References
- 24
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 10 · 2023: 3 · 2022: 9 · 2021: 6 · 2020: 7 · 2019: 7 · 2018: 8 · 2017: 8 · 2016: 10 · 2015: 12 · 2014: 13 · 2013: 15 · 2012: 17
- FWCI
- 8.23
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- General Hospital Psychiatry (publishedVersion)
- PubMed (publishedVersion)
- Murdoch University Research Portal (submittedVersion)
- Funders
- National Institute of Diabetes and Digestive and Kidney Diseases (R01DK081121)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Education
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
- Keywords
- depression, type 2 diabetes, glycemic control, HbA1c, veterans, longitudinal effects, comorbidities, coronary artery disease, stroke, hypertension
- MeSH terms
- Aged, Depressive Disorder, Diabetes Mellitus, Type 2, Female, Health Surveys, Glycated Hemoglobin, Humans, Longitudinal Studies, Male, Middle Aged, Veterans, Comorbidity
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