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. 2023 Dec 29;11(1):e920. doi: 10.1002/ams2.920

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© 2023 The Authors. Acute Medicine & Surgery published by John Wiley & Sons Australia, Ltd on behalf of Japanese Association for Acute Medicine.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Flow diagram of the study design. Initially, we considered a total of 47,366,222 hospitalization episodes recorded in the Diagnosis Procedure Combination (DPC) database spanning from April 2016 to May 2022. From this vast data set, we narrowed our focus to 48,758 cases characterized by acute meningitis. Among these, 3,082 cases experienced mortality during hospitalization. These patients were further categorized into bacterial, viral/aseptic, fungal, tuberculous, carcinomatous, and other/unknown types of meningitis. The mortality rate and the demographic risk factors of mortality were evaluated in each of these types.