Fig. 1

Study design. The date of first COVID-19 diagnosis was defined as the index date, and the index period was April 1 through May 31, 2020. For each patient, the baseline phase included the 12 months before the index date, and the post-acute phase included the 12 months after the end of the acute phase of COVID-19 illness. ^aThe acute phase, defined as the 30-day period after the index date, was excluded from analysis