Outcomes of COVID-19 in the Omicron-predominant wave: large-scale real-world data analysis with a comparison to influenza.

ABSTRACT:

Purpose

Studies on COVID-19 mortality during the Omicron-predominant wave have focused primarily on the inpatient/emergency room setting, and real-world data including both inpatients and outpatients are lacking.

Methods

Patients diagnosed with COVID-19 (n = 27,440,148) or influenza (n = 8,179,641) from January 2020 to April 2023 were identified using nationwide claims data in Japan. Patients with COVID-19 in the Omicron-predominant wave were compared with their counterparts in earlier waves, and a subset of the former group (May 2022-April 2023) was compared with patients with influenza as controls.

Results

The mortality rates (average number of deaths/cases per week) of COVID-19 decreased over time, being 2.7% (169/6312), 2.1% (397/18,754), 0.7% (195/28,273), and 0.

SUBMITTER: Miyashita K 

PROVIDER: S-EPMC11796215 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature