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Original ArticlesEpidemiology and Outcomes
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Associations between Depressive Symptoms and Incident ESRD in a Diabetic Cohort

Margaret K. Yu, Noel S. Weiss, Xiaobo Ding, Wayne J. Katon, Xiao-Hua Zhou and Bessie A. Young
CJASN May 2014, 9 (5) 920-928; DOI: https://doi.org/10.2215/CJN.08670813
Margaret K. Yu
*Health Services Research and Development and
†Division of Nephrology, Department of Medicine,
Departments of ‡Epidemiology,
§Kidney Research Institute, and
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Noel S. Weiss
Departments of ‡Epidemiology,
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Xiaobo Ding
‖Biostatistics, and
¶Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing, China
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Wayne J. Katon
**Department of Psychiatry and Behavioral Sciences, University of Washington–School of Medicine, Seattle, Washington;
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Xiao-Hua Zhou
‖Biostatistics, and
††Epidemiologic Research and Information Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington;
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Bessie A. Young
*Health Services Research and Development and
†Division of Nephrology, Department of Medicine,
Departments of ‡Epidemiology,
§Kidney Research Institute, and
††Epidemiologic Research and Information Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington;
‡‡Health Services, University of Washington–School of Public Health, Seattle, Washington; and
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Abstract

Background and objectives Comorbid major depression is associated with adverse health outcomes in patients with diabetes, but little is known regarding its associations with long-term renal outcomes in this population. Furthermore, the impact of minor depression on renal outcomes is not known. This study evaluated associations between depressive symptoms and risk of incident ESRD in a diabetic cohort.

Design, setting, participants, & measurements In this prospective, observational cohort study, 3886 ambulatory adults with diabetes were recruited from primary care clinics of a large health maintenance organization in the state of Washington. Demographics, laboratory data, depressive symptoms (based on the Patient Health Questionnaire-9), and patterns of diabetes self-care were collected. Participants were considered depressed if they had the required number of depressive symptoms (≥5 for major or 2–4 for minor depressive symptoms), including depressed mood or anhedonia, >50% of the time for ≥2 weeks and a Patient Health Questionnaire-9 score≥10 for major and ≥5 for minor depressive symptoms. Risk of incident ESRD was estimated using Cox proportional hazards regression, with predialysis death as a competing risk.

Results During a median follow-up of 8.8 years, 87 patients (2.2%) developed ESRD. Major depressive symptoms were associated with a higher risk of incident ESRD (hazard ratio, 1.85; 95% confidence interval, 1.02 to 3.33) after adjusting for age, sex, race/ethnicity, marital status, education, smoking, body mass index, diabetes duration, hemoglobin A1c, baseline kidney function, microalbuminuria, hypertension, renin-angiotensin system blockers, and adherence to diabetes self-care. Minor depressive symptoms were not significantly associated with incident ESRD (hazard ratio, 1.08; 95% confidence interval, 0.52 to 2.25).

Conclusion Major depressive symptoms, but not minor depressive symptoms, were associated with a higher risk of incident ESRD over 10 years. Additional studies are needed to determine whether treatment for depression can improve renal outcomes in patients with diabetes.

Introduction

Patients with diabetes mellitus have a high prevalence of clinically important depressive symptoms, with estimates ranging from 11.4% to 31.0% depending on the method of assessment (1). The presence of comorbid depression with diabetes is associated with higher symptom burden (2,3), worse glycemic control (4), nonadherence to recommended self-care and treatments (5–8), and adverse outcomes, including mortality (9–13). Although depression has been shown to be associated with diabetic kidney disease in cross-sectional studies (10,14), its role in the incidence of ESRD in this population is still under investigation.

Studies have yielded conflicting results concerning depression as a risk factor for ESRD. In small prospective cohort studies of persons with known mild to severe CKD not yet on dialysis, depression was a predictor of progression to ESRD after adjustment for demographic variables and comorbidities (15,16). However, these studies were conducted in patients with a high likelihood of progression to ESRD because of preexisting CKD. In contrast, depressive symptoms were not predictive of incident ESRD in the Cardiovascular Health Study, a community-based cohort of individuals with a low likelihood of ESRD incidence (17). These discrepancies in findings may be attributable to differences in the underlying study populations, baseline levels of CKD, participant risk for ESRD, and definitions of ESRD. Although diabetes mellitus is the leading cause of kidney failure (18), information is lacking regarding whether major depression is a risk factor for ESRD in this high-risk population. Moreover, the impact of minor depression on adverse renal outcomes is not known. The primary objective of this study is to evaluate associations between major or minor depressive symptoms and risk of incident ESRD in the Pathways Study, a prospective, population-based observational cohort of primary care patients with diabetes.

Materials and Methods

Study Design

The Pathways Study is a prospective, observational cohort study developed by a multidisciplinary team from the University of Washington and the Group Health (GH) Research Institute to study associations of depression with diabetes outcomes. The study has been described in detail elsewhere (19,20). Briefly, GH is a vertically integrated health maintenance organization with >600,000 enrollees in Washington and Idaho. In 2001 and 2002, surveys were mailed to 9063 potential participants identified from the GH diabetes registry from nine selected primary care clinics; 1222 patients were later determined ineligible because of death, disenrollment, no diabetes, gestational diabetes, severe illness, language/hearing barriers, or cognitive impairment (Figure 1). Of the eligible patients (n=7841), 61.7% (n=4839) returned the baseline epidemiologic survey regarding demographics, diabetes history, and depression, of which 85.3% (n=4128) gave written consent to link survey results with GH automated databases regarding laboratory results and clinical encounters. Participants were followed until the development of ESRD, death, GH disenrollment, or the end of the 10-year study period (August 15, 2012). Participants were excluded from the present study if they had ESRD at baseline or missing depression status. Because baseline kidney function was ascertained using laboratory data up to 6 months after study enrollment, participants were also excluded if they developed incident ESRD, died, or disenrolled from GH within 6 months of study enrollment. The study protocol was approved by the GH and University of Washington institutional review boards.

Figure 1.
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Figure 1.

Pathways Study participant recruitment. *Components add up to more than the total N because of overlap.

Primary Predictor

The primary predictor was the presence of depressive symptoms at study entry, determined by the Patient Health Questionnaire-9 (PHQ-9) (21), which is based on the Diagnostic and Statistical Manual (Fourth Edition) criteria for major depression and has been validated in patients with CKD (22). Participants were considered depressed if they had the required number of depressive symptoms (five or more for major depression or two to four for minor depression), including either depressed mood or anhedonia, >50% of the time for at least 2 weeks. Using these criteria, participants with major and minor depressive symptoms had a minimum PHQ-9 score of 10 and 5, respectively (11). Major depression has been shown to often be a chronic illness in patients with diabetes, with >70% of patients stating that they had been ill for over 5 years (23); moreover, in a recent prospective trial, >80% of patients meeting criteria for major depression at 5 years of follow-up had either major or minor depression at baseline interview (24).

Covariates

Demographics and diabetes characteristics were self-reported from the baseline survey. Baseline hemoglobin A1c (HbA1c) and LDL were based on average results in the 12 months before study enrollment. Because of a higher proportion of missing values, baseline creatinine was determined by the average creatinine in the 18 months before or 6 months after study entry if no prior results were available. Chronic Kidney Disease Epidemiology Collaboration equations were used to calculate eGFR (25). Microalbuminuria was defined as a urine albumin to creatinine ratio≥30 mg/g in the 24 months before or 6 months after study entry. Hypertension was identified by International Classification of Diseases, Ninth Revision diagnosis code (ICD-9) 401.x (26). Medication use, including angiotensin-converting enzyme inhibitors, angiotensin receptor blockers, and antidepressants, was obtained from GH pharmacy records. Diabetes self-care was assessed using the modified Summary of Diabetes Self-Care Activities (SDSCA), which is a questionnaire that asks how many days per week an activity was performed (Table 1) (27). Each self-care domain (general diet, special diet, exercise, blood glucose testing, and foot care) was given a score ranging from zero to seven, with higher scores indicating better compliance.

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Table 1.

Selected questions from the Summary of Diabetes Self-Care Activities

Outcome

The primary outcome was the development of ESRD requiring dialysis or kidney transplant. The date of first dialysis or transplant was determined by GH automated records using the following ICD-9 and procedure codes: ESRD or uremia (585.x and 586.x), kidney transplant (50360, 50365, and 55.69), dialysis (39.95, 54.98, 90935, 90937, 90945, 90947, and G0257), dialysis training (90989 and 90993), or ESRD-related services (90918–90925, 90960–90970, 90999, G0311–G0319, G0323, and G0327).

Statistical Analyses

Statistical analyses were performed using Stata, version 12 (StataCorp, College Station, TX) and R 2.15.2 (R Project for Statistical Computing; http://www.r-project.org/). Baseline characteristics by depression status were determined using one-way ANOVA for continuous variables, chi-squared tests for categorical variables, and Mann–Whitney tests for skewed variables. Cox proportional hazards regression models were used to analyze the associations between depression and the primary outcome (28). A competing risks model was used to incorporate the risk of pre-ESRD death in the hazards estimates for ESRD (29). The primary predictor was included in the model as major, minor, or no depressive symptoms. Multiple imputation by chained equations was used for covariates with missing values (race/ethnicity, marital status, education, salary, body mass index [BMI], diabetes type, diabetes duration, HbA1c, eGFR, microalbuminuria, and diabetes self-care) (30,31). Participants were considered at risk starting 6 months after study enrollment and followed longitudinally for up to 10 years after study entry. Participants were censored at the date of GH disenrollment or the end of the study. Unadjusted analyses were performed for each covariate of interest. In the multivariate analysis, it was decided a priori to adjust for age, sex, race/ethnicity, marital status, education, BMI, diabetes duration, HbA1c, eGFR, hypertension, and angiotensin-converting enzyme inhibitor/angiotensin receptor blocker use as potential confounders. Based on their associations with depression and ESRD, other covariates of interest were smoking and baseline microalbuminuria (model 1). A second model included additional adjustments for SDSCA scores (model 2) to assess the effect of diabetes self-care on the associations between depression and outcomes of interest. Baseline antidepressant use was not included as a covariate because it is confounded by symptom severity (32,33); however, it was included in a sensitivity analysis that did not show substantially different results from the primary analysis. Other sensitivity analyses included adjustment for obesity instead of BMI and exclusion of baseline eGFR from both models. We also tested interactions between the primary predictor and either sex or age. The primary results are presented in Results.

Results

Baseline Characteristics

Of the 3886 participants in this study, 448 (11.5%) participants had major and 327 (8.4%) participants had minor depressive symptoms. Mean PHQ-9 scores were 17.2±3.8 for major depressive symptoms, 9.6±2.2 for minor depressive symptoms, and 3.7±3.4 for no depressive symptoms. Participants with major depressive symptoms tended to be younger, women, and non-Hispanic black, and they had lower levels of education and salary compared with those participants without depressive symptoms (Table 2). Participants with depressive symptoms were more likely to be smokers and have a higher BMI than participants without depressive symptoms. The prevalence of hypertension, dyslipidemia, and type 1 diabetes was similar between groups. Participants with major depressive symptoms had the poorest baseline metabolic control (mean HbA1c=8.1±1.6 versus 7.9±1.6 for minor and 7.7±1.5 for no depressive symptoms) and highest baseline eGFR (77.3±23.5 ml/min per 1.73 m2 versus 71.6±24.8 ml/min per 1.73 m2 for minor and 73.6±21.7 ml/min per 1.73 m2 for no depressive symptoms), and they also had the highest proportion of microalbuminuria (39.6% versus 36.2% for minor and 30.5% for no depressive symptoms) compared with the other groups. Adherence to recommended diet and exercise was lowest in participants with major depressive symptoms and highest in participants with no depressive symptoms; adherence to blood glucose testing and self–foot care was comparable between groups. A greater proportion of participants with major depressive symptoms was prescribed antidepressants at baseline (52.2% versus 27.5% for minor and 15.4% for no depressive symptoms). Renin-angiotensin system blocker use was similar between groups.

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Table 2.

Baseline characteristics of Pathways Study cohort by depression status (n=3886)

Incident ESRD by Depression Status

In total, 87 participants developed ESRD over 26,397 patient-years at risk, for an incidence rate of 3.30 cases per 1000 patient-years (95% confidence interval [95% CI], 2.66 to 4.05) (Table 3). The incidence of ESRD was 6.65 per 1000 patient-years for participants with major depression symptoms (95% CI, 4.07 to 10.31), 4.30 per 1000 patient-years for participants with minor depression symptoms (95% CI, 2.10 to 7.89), and 2.78 per 1000 patient-years for participants without depressive symptoms (95% CI, 2.14 to 3.55). The cumulative incidence of ESRD by depression status is shown in Figure 2.

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Table 3.

Incident rates of ESRD by depression status

Figure 2.
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Figure 2.

Cumulative incidence of ESRD by depression status. Participants with major depressive symptoms had Patient Health Questionnaire-9 scores≥10 and at least five depressive symptoms (including depressed mood or anhedonia) >50% of the time for at least 2 weeks. Participants with minor depressive symptoms had Patient Health Questionnaire-9 scores≥5 and two to four depressive symptoms (including depressed mood or anhedonia) >50% of the time for at least 2 weeks.

Using Cox proportional hazards models with predialysis death as a competing risk, the presence of major, but not minor, depressive symptoms was associated with incident ESRD (Table 4). In model 1, persons with major depressive symptoms at baseline had a 1.90-fold higher risk of incident ESRD (95% CI, 1.09 to 3.32). After additional adjustment for diabetes self-care variables (model 2), the association between major depression symptoms and incident ESRD persisted (hazard ratio [HR], 1.85; 95% CI, 1.02 to 3.33). Minor depressive symptoms were not significantly associated with ESRD risk in either model 1 (HR, 1.08; 95% CI, 0.52 to 2.24) or model 2 (HR, 1.08; 95% CI, 0.52 to 2.25). In both models, other risk factors for incident ESRD included younger age, longer duration of diabetes, higher baseline HbA1c, lower baseline eGFR, and the presence of baseline microalbuminuria. None of the diabetes self-care variables were predictive of incident ESRD. The associations between major depressive symptoms and incident ESRD were robust in each of the sensitivity analyses. Interactions between depressive status and either sex or age were not significant (P>0.05).

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Table 4.

Competing risks regression for time to ESRD in the Pathways Study

Discussion

The current study found that, in this primary care cohort of patients with diabetes, major depressive symptoms were associated with nearly two times the risk of incident ESRD at up to 10 years of follow-up, and this association persisted after adjustment for multiple diabetes self-care variables. In this study, the association between minor depressive symptoms and ESRD risk was not statistically significant. Although patients with diabetes mellitus are at high risk for ESRD, to our knowledge, this study is the first study to show an association between major depressive symptoms and long-term ESRD risk in this population.

Our study observed an association between major depressive symptoms and long-term ESRD risk among primary care diabetic patients. These results are congruent with findings in CKD cohorts, which are also at high risk for ESRD. In a prospective cohort study of predominantly male veterans with CKD stages 2–5, Hedayati et al. (15) found that a history of major depression was associated with a 3.5-fold higher risk of progression to chronic dialysis at 1 year after adjustment for age, race, and baseline kidney function. Similarly, Tsai et al. (16) found that high levels of depressive symptoms in patients with CKD were associated with more rapid decline in kidney function and a higher risk of the combined outcome of incident ESRD or death. In the largest prospective CKD cohort to date, Fischer et al. (34) found that depressive symptoms in the Chronic Renal Insufficiency Cohort Study were associated with a 21% higher risk of CKD progression over 5 years. However, the Cardiovascular Health Study (CHS) did not find an association between depressive symptoms and incident ESRD in their community-based cohort of elderly participants (17). This discrepancy may be related to the low prevalence of CKD in the study population in the CHS and, therefore, a lower incidence of ESRD (<2%) compared with the CKD cohorts in the other studies. Our study contributes to existing literature by showing an association between major depressive symptoms and incident ESRD in a non-CKD primary care population-based cohort. This association was evident after up to 10 years of follow-up, which is a longer duration than any of the previous studies.

Another novel aspect of this study was our ability to adjust for multiple diabetes self-care variables. Although depression is associated with poorer diabetes self-care (5,7,8), and adherence to self-care is associated with reductions in chronic complications of diabetes (35–39), we found that self-reported diabetes self-care was not associated with long-term ESRD risk, and adjustment for self-care did not substantially alter the association between major depressive symptoms and incident ESRD. There are several potential reasons for these negative findings. Although the SDSCA has been shown to be a valid measure of diabetes self-management (27), it is still self-reported rather than objectively measured, and it may incompletely or imprecisely capture diabetes self-care. Our study ascertained diabetes self-care at study entry and does not account for behavioral changes over time. Finally, diabetes self-care may affect chronic diabetic complications through metabolic and cardiovascular risk factor control, which was already adjusted for in our models; this finding may explain why additional adjustment for diabetes self-care did not have an appreciable impact on the association between major depressive symptoms and ESRD risk.

We did not find a statistically significant association between minor depressive symptoms and long-term ESRD risk. Our analysis is limited by the low event rate in this group. Although minor depression is common in patients with ESRD (40), it is not currently known whether minor depression is associated with CKD incidence or progression. Minor depression has not been found to be associated with other diabetic micro- or macrovascular complications, but it is associated with increased mortality in patients with diabetes (9,11,41). Additional research on its associations with adverse renal outcomes is needed.

Major depression may be associated with ESRD risk through several potential mechanisms. In patients with diabetes, comorbid depression is associated with a higher number of cardiovascular risk factors compared with those patients without depression (42). Although we attempted to control for common cardiovascular risk factors, we were unable to account for actual BP measurements or changes in cardiovascular risk factors over time. Depression is associated with medication nonadherence (5,7,8), which was not measured in this analysis. Depression is also associated with poorer diabetes self-care (5,7,8), which might, to a small extent, mediate the association between depression and ESRD, despite our study’s negative findings. Depression is associated with a proinflammatory state (43), which has been linked with a higher risk of diabetic complications, including diabetic kidney disease (44). Lastly, depression is associated with hyperactivity of the hypothalamic–pituitary–adrenocortical axis and sympathetic nervous system, resulting in reduced insulin sensitivity and potentially poorer glycemic control (45).

The results from this study lend support to the current American Diabetes Association guidelines, which recommend screening for depression in patients with diabetes and poor self-management (grade B recommendation) (46). Moreover, the expert opinion is that psychological assessment is a reasonable component of comprehensive diabetes management. Nonetheless, additional studies are needed to determine whether routine screening and treatment of depression in diabetic patients can reduce the risk of ESRD.

There are several notable limitations of this study to consider. Depression was ascertained by a self-rated questionnaire rather than a clinical interview; although the PHQ-9 has been validated against the gold standard clinical interview (22), a recent meta-analysis found that self-reported depression scales may overestimate the presence of major depression compared with the clinical interview (47). This study only used depression status at study entry rather than multiple measures over time. However, our group previously found that, in this cohort of primary care diabetic patients, over 70% of those patients with major depressive symptoms had a history of chronic depression lasting over 2 years (23), and over 80% of patients with major depressive symptoms after 5 years of follow-up had major or minor depressive symptoms at study entry (24). We did not adjust for BP, because these values were unavailable; although we did adjust for hypertension based on ICD-9 codes, these values do not discriminate between treated and untreated hypertension or optimal versus suboptimal BP control. However, a prior prospective study showed that patients with comorbid major depression and diabetes had similar BP control over a 5-year period as patients with diabetes alone (48). Although we adjusted for prescription of renin-angiotensin system inhibitors, we did not have a measure of medication adherence, which differs by depression status. Because this population was insured, generalizability of results may be limited to other patient populations with comparable access to health care. Furthermore, although the study had an acceptable response rate, our estimated incidence of ESRD may be biased, because the incidence rate of ESRD is not known for the nonrespondents. Finally, as an observational study, unmeasured and residual confounding are always possible. However, our study has several strengths, including its large sample size, prospective design, primary care population base, long length of follow-up, and ability to adjust for multiple covariates, including diabetes self-care variables.

Major depressive symptoms were associated with a higher risk of development of ESRD in a primary care population with diabetes, even after adjustment for the quality of diabetes self-care. Additional studies are needed to determine whether screening and treatment of depression reduce the incidence of ESRD in patients with diabetes.

Disclosures

W.J.K. reports board membership with Eli Lilly and Wyeth and honoraria for lectures from Eli Lilly, Wyeth, Pfizer, and Forest. No other disclosures are reported.

Acknowledgments

We thank Dr. Michael Von Korff, Dr. Elizabeth Lin, Dr. Evette Ludman, and Malia Oliver for their roles in study design, data acquisition, and obtainment of funding for the Pathways Study, which was supported by National Institute of Mental Health Services Grants MH41739 and MH01643.

M.K.Y. was supported, in part, by the American Kidney Fund. In addition, this material is the result of work supported by resources from the Veterans Affairs Puget Sound Health Care System (M.K.Y. and B.A.Y.).

The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health or the Veterans Affairs Puget Sound.

Footnotes

  • Published online ahead of print. Publication date available at www.cjasn.org.

  • Received August 19, 2013.
  • Accepted December 9, 2013.
  • Copyright © 2014 by the American Society of Nephrology

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Clinical Journal of the American Society of Nephrology: 9 (5)
Clinical Journal of the American Society of Nephrology
Vol. 9, Issue 5
May 07, 2014
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Associations between Depressive Symptoms and Incident ESRD in a Diabetic Cohort
Margaret K. Yu, Noel S. Weiss, Xiaobo Ding, Wayne J. Katon, Xiao-Hua Zhou, Bessie A. Young
CJASN May 2014, 9 (5) 920-928; DOI: 10.2215/CJN.08670813

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Associations between Depressive Symptoms and Incident ESRD in a Diabetic Cohort
Margaret K. Yu, Noel S. Weiss, Xiaobo Ding, Wayne J. Katon, Xiao-Hua Zhou, Bessie A. Young
CJASN May 2014, 9 (5) 920-928; DOI: 10.2215/CJN.08670813
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Epidemiology and Outcomes

  • Acute Kidney Injury among Black Patients with Sickle Cell Trait and Sickle Cell Disease
  • Acute Kidney Injury, Microvascular Rarefaction, and Estimated Glomerular Filtration Rate in Kidney Transplant Recipients
  • The Association of Time to Organ Procurement on Short- and Long-Term Outcomes in Kidney Transplantation
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