Individual Income Status Correlates with Chronic Kidney Disease in Japan beyond Metabolic Risk Factors
Chronic kidney
disease (CKD) is a condition characterized by a gradual loss of kidney function
over time. It is also a pre-condition for end-stage kidney disease (ESKD)
undergoing hemodialysis, as well as a risk factor for cardiovascular disease,
which is the main cause of death worldwide. Therefore, it is vital that CKD
prevention measures be established. In particular, socioeconomic status (SES),
as represented by income, contributes to non-communicable diseases like CKD.
The purpose of this study was to examine the independent association between
CKD and individual SES in Japan, with consideration of other metabolic risks.
In the present
study, the authors analyzed the 2011 National Health and Nutrition Survey by
the Ministry of Health, Labor, and Welfare. Specifically, they analyzed 3,557
people out of 8,762 whose serum creatinine was measured. Logistic regression
analysis was used to calculate the odds ratio (OR) of CKD by income
distinction, after adjustment for age and metabolic risks (obesity, diabetes
mellitus, dyslipidemia, and hypertension), which were assessed at the medical
examination.
The results
indicated that CKD was found in 385 participants (10.8%) and was associated
with greater age, obesity, higher levels of low-density lipoprotein
cholesterol, triglyceride, and glycated hemoglobin, and lower levels of
hemoglobin and high-density lipoprotein cholesterol. The adjusted model
indicated a significant association between lower income and CKD: the OR of the
low income group (<2 million yen) was 1.33 (95% confidence interval: 1.01 -
1.78) in comparison with the high income group.
In conclusion, the
results of the present study indicate a substantial relationship between
individual lower income status and CKD in Japan, where healthcare is easy to
access. To prevent ESKD and cardiovascular diseases, early detection of CKD and
its metabolic risks is necessary, especially among the socioeconomically
vulnerable population. Besides, further studies are needed to assess the
association between temporal variations in SES and CKD prevalence.
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Image by Erion Shehaj, from Flickr-cc.
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