Trends in COVID-19 lethality and mortality rates in the State of Pernambuco, Brazil: a time series analysis from april 2020 to june 2021

Introduction: continual mutations of the sars-cov-2 virus, with the possibility of reinfection or reactivation of the virus, can lead to a further spread of the virus and consequently new infection periods. The state of pernambuco, brazil, has faced many adversities amidst the pandemic, requiring studies and new spatiotemporal techniques to understand the pandemic development and planning actions to reverse the current situation. Objective: the aim was to evaluate the mortality and lethality trends of covid-19 from april 2020 to june 2021 in the state of pernambuco, brazil, with the division into two periods according to the waves of infection to date (1st period and 2nd period). Methods: an ecological time-series study was carried out with population data from the pernambuco state health department. We collected the number of confirmed cases and deaths for covid-19. The trends were analyzed according to the prais-winsten regression model in two moments from march 2020 to september 2020 and the second from october 2021 to june 2022. Differences were considered significant when p