Table 2.

Categories by Timing of Predictor Measurement and Outcome

No.	Category
1	First/early contact with healthcare facility ➝ Fatal outcome
2	First/early contact with healthcare facility ➝ Deterioration (severity, ICU admission, need for mechanical ventilation, respiratory complication, specific organ failures, or fatal outcome as a composite endpoint, etc.)
3	Severe disease or ICU admission ➝ Deterioration or fatal outcome
4	First diagnosis and contact with outpatient healthcare facility ➝ Hospitalization
5	Acute infection ➝ PCC

Contact with healthcare facility also includes hospital or emergency department (ED) admission or the first diagnosis by SARS-CoV-2 testing. Abbreviations: ICU, intensive care unit; PCC, post-COVID-19 condition; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.