If the 95% confidence interval of the estimated AAPC is greater than 0, the age-standardized indicator indicates an increasing trend; if it is less than 0, a decreasing trend is observed; and if it includes 0, the trend is considered stable ( 22 , 23 ).
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Analysis and comparison of the trends in the burden of migraine in China and globally from 1990 to 2021, with a forecast to 2031.
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