According to the Joinpoint trend analysis from 1995 to 2015, the years 1995–2005 showed an increasing trend, and the years 2005–2015 experienced an increasing and then decreasing trend, with the year 2011 as the boundary.
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Long-term trends in the burden of edentulism in China over three decades: A Joinpoint regression and age-period-cohort analysis based on the global burden of disease study 2019.
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The sentences
The cohort effect showed a decreasing trend for the risk of developing dental agenesis in the Chinese population during the observation period 1990–2019.