Binational Analysis of Maternal Mortality Between Brazil and Portugal in 2020-2023: A Population-Based Epidemiological Study.

The application of a Poisson regression model offset by the number of live births indicated an annual decreasing trend of approximately 14.2% (IRR = 0.8576); however, this trend did not reach statistical significance ( p = 0.138), suggesting that, although maternal mortality fluctuated and globally decreased during the period, this variation can be attributed to the small absolute number of events and the natural variability of the estimates.

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Compared to the 20–29 year old group (reference), women aged 30–39 years had an IRR of 1.714 and women aged 40–49 years had an IRR of 2.716, both highly significant differences.

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