Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Income Levels and Mortality Rates in Patients with Chronic Kidney Disease in South Korea: a Population-Based Cohort Study Using National Health Insurance Data

Version 1 : Received: 6 August 2020 / Approved: 6 August 2020 / Online: 6 August 2020 (09:46:30 CEST)

How to cite: Choi, Y. Income Levels and Mortality Rates in Patients with Chronic Kidney Disease in South Korea: a Population-Based Cohort Study Using National Health Insurance Data. Preprints 2020, 2020080143 (doi: 10.20944/preprints202008.0143.v1). Choi, Y. Income Levels and Mortality Rates in Patients with Chronic Kidney Disease in South Korea: a Population-Based Cohort Study Using National Health Insurance Data. Preprints 2020, 2020080143 (doi: 10.20944/preprints202008.0143.v1).

Abstract

Background: To examine the association between income levels and mortality rates in patients with chronic kidney disease. Methods: We analyzed data obtained from 3,172 patients with chronic kidney disease obtained from the Korean National Health Insurance claims database (2003–2009). Each patient was monitored until December 2010 or until death, whichever came first. Individual income was estimated from the national health insurance premium. Information on mortality was obtained from the Korean National Statistical Office. Cox proportional hazard models were used to compare mortality rates between different income groups after adjusting for possible confounding risk factors. Results: A low income was significantly associated with a high mortality rate after adjusting for covariates (adjusted HR 1.298 [1.082–1.556]). In addition, dialysis patients who had low incomes were more likely to have higher mortality rates compared to those in dialysis patients who had high incomes (adjusted HR 1.528 [1.122–2.082]). Conclusion: The findings of this study indicate that chronic kidney disease patients with low incomes have the highest mortality risk. Promotion of targeted policies and priority health services for patients with low incomes may help reduce the mortality rate in this vulnerable group.

Subject Areas

chronic kidney disease; low socioeconomic status; mortality

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