As for period effect, the prevalence showed a trend of rising and then declining, and continued to rise after reaching the turning point, which occurred between 2010 and 2015 for high SDI and other SDI levels were between 2005 and 2010 ( Figure 4 ).
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Global, Regional, and National Burden of Neck Pain in Young Population, 1990-2021: An Age-Period-Cohort Analysis and Projections to 2050 Based on the Global Burden of Disease Study 2021.
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In terms of cohort effect, there was an increasing trend in prevalence in the low-middle SDI and low SDI regions, while it showed a decreasing trend in other SDI regions ( Figure 4 ).