- Infants (Under 1 Year)
- Children (1-14 years)
- Youth (15-24 years)
- Adults (25-64 years)
- Seniors (65 years and over)

Classification of COVID-19 Studies in China by Age Groups

- Gender
- Age
- Race
- Ethnicity
- Marital status
- Income
- Education
- Employment

University of Michigan - Ann Arbor

- Transmission
- Communicable Period
- Fatality
- Control Strategies
- Secondary Infections
- Patient Comorbidities
- Patient Outcomes
- Signs
- Symptomology
- Case Demographics of Patients
- Provinces
- Time from Onset to Reporting

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