- 0-19 (n=123): 1.6–2.5%
- 20-44 (n=705): 14.3–20.8%
- 45-54 (n=429): 21.2–28.3%
- 55-64 (n=429): 20.5–30.1%
- 65-74 (n=409): 28.6–43.5%
- 75-84 (n=210): 30.5–58.7%
- >=85 (n=144): 31.3–70.3%
- Total (n=2,449): 20.7–31.4%

Hospitalization Among COVID-19 Patients in the United States by Age

- 0-19 (n=123): 0%
- 20-44 (n=705): 2.0–4.2%
- 45-54 (n=429): 5.4–10.4%
- 55-64 (n=429): 4.7–11.2%
- 65-74 (n=409): 8.1–18.8%
- 75-84 (n=210): 10.5–31.0%
- >=85 (n=144): 6.3–29.0%
- Total (n=2,449): 4.9–11.5%

ICU Admission Among COVID-19 Patients in the United States by Age

- 0-19 (n=123): 0%
- 20-44 (n=705): 0.1–0.2%
- 45-54 (n=429): 0.5–0.8%
- 55-64 (n=429): 1.4–2.6%
- 65-74 (n=409): 2.7–4.9%
- 75-84 (n=210): 4.3–10.5%
- greater than or equal to 85 (n=144): 10.4–27.3%
- Total (n=2,449): 1.8–3.4%

Case-Fatality Among COVID-19 Patients in the United States by Age

Researchers analyzed the amount of hospitalizations by race/ethnicity in 12 states. 
- White Patients: in all 12 states, the percentage of hospitalizations among White patients was significantly less than their representative proportion of their states' populations.  
-	Black Patients: in all 12 states, the percentage of hospitalizations among Black patients was significantly higher than their representative proportion of their states' populations.  (For example, in Indiana, the hospitalizations of Black patients was 28.1%, but their representative proportion of the state population is only 9.8%.)  
-	Hispanic Patients: in 10 states, the percentage of hospitalizations among Hispanic patients was also significantly more than their representative proportion of their states' populations.  
-	Asian Patients: in 6 states, the percentage of hospitalizations for Asians was less than their representative proportion of their states' populations. 
-	American Indian and Alaskan Native (AIAN) Patients: in 8 states, the percentage of hospitalizations for American Indian and Alaskan Native populations (AIAN) was higher than their representative proportion of their states' populations.  

Hospitalization Among COVID-19 Patients in the United States by Race/Ethnicity

- Hospitalization
- ICU admission
- Case-fatality

University of Michigan - Ann Arbor

Epidemiological studies on COVID-19 in the United States

The progression of COVID-19 varies greatly by individual and demographic, as do many of the factors related to the disease. Studies have been analyzing the disease progression timeline, or the time frames before patients feel symptoms, are admitted to the hospital, are admitted to the ICU, are put on a mechanical ventilator, experience acute respiratory distress syndrome, etc. Not every COVID-19 case will reach each of these events.

COVID-19 Clinical Disease Progression Timeline

On July 27, 2020, the number of confirmed cases was 16,523,815
 worldwide, with 655,112 deaths resulting in a crude fatality rate of 4.0%..

Case Fatality Rate of COVID-19

Severe Outcomes Among COVID-19 Patients in the United States

- Indoor Air Quality
- Air Pollution
- Food Access and Quality
- Drinking Water

COVID-19 and Environmental Factors

- Journal of the American Medical Association
- Morbidity and Mortality Weekly Report (MMWR)

COVID-19 Clinical Disease Progression Timeline References by Journal

COVID-19 Clinical Disease Progression Timeline References by Organization

Categories of COVID-19 Case Fatality Rate

Guglielmo Salvatori, Domenico Umberto De Rose, Carlo Concato,
Dario Alario, Nicole Olivini, Andrea Dotta, and Andrea Campana, DOI: 10.1089/bfm.2020.0095

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