Although further investigation is needed to explain this polynomial trend, it should be noted that the relative health gap between higher-income groups and the Medicaid group was still evident even in 2008–2011 where RII showed a decreasing trend (RII > 1; 2008–2017).
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A 10-year trend in income disparity of cardiovascular health among older adults in South Korea.
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The sentences
Only the Medicaid group showed an increasing trend from 2012/2013, but the increase was not statistically significant.