Fig. 1

Study flow chart. Legend: 853 patients were followed up at 3, 2–3 months after acute COVID-19 disease. Of these, 418 patients were followed up also at 7, IQR 6–10 months and 69 patients also at 26, IQR 20–33 months. Loss to follow up: patients that didn’t keep an appointment or didn’t answer to phone call to schedule next appointments; to be contacted/ongoing: patients with a next scheduled appointment or patients still to be phone contacted. PCC, post COVID-19 condition