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a, Characteristics of (1) people with COVID-19 and VHA users and (2) people who were hospitalized with COVID-19 and people who were hospitalized with seasonal influenza. b, Characteristics of four mutually exclusive groups: (1) VHA users, (2) people with COVID-19 without hospitalization, (3) people hospitalized with COVID-19 but not admitted to intensive care, and (4) people with COVID-19 and admitted to intensive care.
*Data collected within one year before the cohort enrolment.