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. 2021 Mar 22;8:645543. doi: 10.3389/fmed.2021.645543

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Copyright © 2021 Grippo, Grande, Maraschini, Navarra, Pappagallo, Marchetti, Crialesi, Frova, Orsi, Simeoni, Carinci, Loreto, Donfrancesco, Lo Noce, Palmieri, Andrianou, Urdiales, Onder, Minelli and Italian National Institute of Health COVID-19 Mortality Group.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Comorbidities on death certificates of people who tested positive for Sars-COV-2 by type and period: frequency (N), percentage of the total number of death certificates (%), and odds ratios (OR) with 95% confidence intervals (CIs) for the association between comorbidities and deaths occurring in May–September 2020 compared with those in February–April 2020. Analyses are adjusted by age and gender.