Figure 1. Patient Enrollment Flowchart.

Patients who received a diagnosis of COVID-19 from April 1, 2022, to February 20, 2023 were assessed for eligibility to receive treatments in the outpatient setting. Patients who received nirmatrelvir or molnupiravir were selected. Patients who were eligible for each treatment but did not receive any treatment were selected as the comparison group for the corresponding treatment group. GFR indicates glomerular filtration rate.