Impact of vaccination in reducing daily mortality during the covid-19 pandemic

Abstract

The pandemic of the new coronavirus-2019 is a threat to life worldwide and the most effective means to combat it is vaccination. However, research on its impact during the vaccination process is scarce. The aim of the present study is to determine the impact of Covid-19 on mortality reduction. For this purpose, ecological analysis of Covid-19 in available databases from 30 countries was carried out. The open-access data created by the organization Our World in Data, attached to the University of Oxford, was analyzed from the first reports of the vaccination process, December 8, 2020, until the last update made on February 17, 2022, with 9,243 daily data grouped by country. In this data, four predictor variables for Covid 19 death were analyzed: ICU per million, hospitalization per million, date and percentage of vaccination. A Multiple Linear Regression model allowed us to find a level of prediction of mortality equivalent to 0.33 showing that the greatest predictor of mortality is admission to ICU and the greatest predictor of mortality reduction is vaccination. Namely, for each percentage point increase at the cut-off date of this study, the daily mortality of 5.67 patients per million population is reduced. We conclude on the importance of vaccination and the need to continue this study to know the real impact of vaccination on mortality.