Global, regional, and national burden of migraine in postmenopausal women: a 32-year analysis from the global burden of disease study 1990-2021.

A positive EAPC with a 95% confidence interval (CI) that does not include zero indicates an increasing trend, whereas a negative EAPC indicates a decreasing trend [ 11 ]. ln(ASR) is the natural logarithm of the age-standardized rate, α is the intercept, β is the slope coefficient representing the average annual change in the log-transformed rate, Year is the calendar year, and ε is the error term.

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