Publications by authors named "Andre S Olak"
Vaccination campaigns played a crucial role in reducing the incidence of COVID-19. However, a scant number of studies evaluated the impact of vaccination on case fatality rates (CFRs), including in Brazil. Our study aimed to compare CFRs according to vaccination status among subjects living in Arapongas (Paraná State, Brazil), considering the age composition of the population.
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- * Researchers compared three statistical models (exponential, Weibull, and lognormal) to find the most accurate one for predicting mortality risks, using data from 7,684 hospitalized patients.
- * Key findings revealed that older age, being male, having severe comorbidities, needing ICU care, and using invasive ventilation significantly raised the chances of in-hospital death, with a case fatality rate of 32.78%.
Background: Recent studies have established that vaccination plays a significant role in reducing COVID-19-related deaths. Here, we investigated differences in COVID-19 case fatality rates (CFRs) among vaccinated and unvaccinated populations, and analyzed whether the age composition of confirmed cases has a significant effect on the variations in the observed CFRs across these groups.
Methods: The study considered 59,853 confirmed cases and 1,687 deaths from COVID-19, reported between January 1 to October 20, 2021, by the Health Department of Londrina, a city in Southern Brazil.
Meteorological parameters and cases of COVID-19 in Brazilian cities: an observational study.
J Toxicol Environ Health A
January 2022
Meteorological parameters modulate transmission of the SARS-Cov-2 virus, the causative agent related to coronavirus disease-2019 (COVID-19) development. However, findings across the globe have been inconsistent attributed to several confounding factors. The aim of the present study was to investigate the relationship between reported meteorological parameters from July 1 to October 31, 2020, and the number of confirmed COVID-19 cases in 4 Brazilian cities: São Paulo, the largest city with the highest number of cases in Brazil, and the cities with greater number of cases in the state of Parana during the study period (Curitiba, Londrina and Maringa).
View Article and Find Full Text PDFObjectives: The aim of this research was to address risk factors associated with death after hospitalization in intensive care units (ICUs) in 728 COVID-19 patients in Londrina, the second most populated city in the State of Paraná - Brazil, between March and December 2020.
Methods: Statistical analysis, including multiple logistic regression was performed to identify risk factors associated with death in these patients.
Results: The results showed that age (60 years or more, O.