Fig. 1
From: Cough and sputum in long COVID are associated with severe acute COVID-19: a Japanese cohort study
Flow chart of the study cohort. A total of 1200 patients were registered in the Long COVID-19 Sequelae study; 134 patients with incomplete medical records were excluded. A total of 1066 patients were included in the analysis. Patients reported questionnaires at 3-, 6-, and 12-months post-diagnosis. Among the patients, 935, 865, and 724 completed 3PRO, 6PRO, and 12PRO, respectively, and 690 completed all PROs. COVID-19, coronavirus disease 2019; PRO, patient-reported outcome