Early-stage chronic kidney disease as a risk factor for suicide: a nationwide observational cohort study

Abstract

Background Chronic kidney disease (CKD) is associated with poor psychological well-being. Whether early-stage CKD is a risk factor for suicide warrants further research. Methods This nationwide, retrospective, cohort study aimed to evaluate the risk of suicide in patients with early-stage CKD and identify the associated risk factors. A total of 3.945,198 individuals aged >= 19 years who underwent the 2009 national health screening in South Korea were studied. Among them, 202,291 patients had early-stage CKD (estimated glomerular filtration rate (eGFR) >= 30 and < 60 mL/min per 1.73 m2 and/or dipstick albuminuria >= 1 +). The study outcome was suicide as confirmed by the nationwide death register based on death certificates. Results The study population had a mean age of 59 +/- 15 years, and 47% were male. We identified 930 suicides (incidence rate, 0.45 per 1000 person-years) in the CKD group and 11,332 suicides (incidence rate, 0.27 per 1000 person-years) in the non-CKD group. Early-stage CKD was significantly associated with an increased risk of suicide in multivariable analysis adjusted for demographic characteristics; lifestyle habits; comorbidities, including diabetes and hypertension; economic status; and depression, bipolar disorder, schizophrenia (hazard ratio, 1.18; 95% confidence interval 1.10-1.26). Suicide incidence was higher in individuals with proteinuria but preserved kidney function (eGFR > 60 mL/min per 1.73 m2 and dipstick albuminuria > 1 +) than in those without CKD. Conclusion Healthcare providers may need to examine the mental health of patients with early-stage CKD to prevent suicide.