Prevalence and temporal trend of prematurity in Brazil before and during the COVID-19 pandemic: a historical time series analysis, 2011-2021.

Objective: to measure the prevalence of prematurity according to the Brazilian macro-regions and maternal characteristics over the past 11 years; to compare the proportions during the COVID-19 pandemic (2020-2021) with those of the historical series (2011-2019).

Methods: this was an ecological study, with data from the Live Birth Information System; the prevalence was calculated according to year, macro-region and maternal characteristics; time series analysis was performed using Prais-Winsten regression model.

Results: the prevalence of preterm birth in 2011-2021 was 11.

Maternal mortality in South region of Brazil: an analysis from 2000 to 2018.

This study characterises maternal mortality in southern Brazil and verifies its trends between 2000 and 2018. It is an ecological time-series study, analysing secondary data from the Department of Informatics of the Unified Health System. The trend of the maternal mortality ratio (MMR) was calculated using generalised linear regression, and the ratios of the rates according to women's characteristics, with a confidence interval (CI) of 95%.