What is the difference in survival rates of people infected with covid who are members of the group defined as all people 70 years of age and older (say) compared with the group of all people of that age group who are in perfect health (except for having covid), i.e. no comorbidities (nonsmokers, not medically overweight, no diabetes, etcetera)?
Note that by infected I mean all cases including mild or even asymptomatic cases.
https://www.forbes.com/sites/theapothecary/2020/10/06/what-is-your-risk-of-dying-from-covid-19/?sh=7478f66a6159 takes an approach that I like, which is to give plenty of easily understood numbers, with easily understood units like loss of life expectancy, but it seems to me that Forbes neglect the fact that the older you are, the more likely you are to have a comorbidity or two and therefore presumably some or maybe even most of the reason old people tend to have high death rates from covid is that the comorbidities killing people and age is correlated with that.
Forbes says: "Those under age 50 who get infected with the coronavirus lose less than one day of discounted quality-adjusted life expectancy; seniors age 70 or older lose nearly 90 days."
There is no information about what the loss of days of life expectancy is for healthy seniors.
https://www.cdc.gov/coronavirus/2019-ncov/covid-data/investigations-discovery/hospitalization-death-by-age.html also makes no mention of comorbities.
https://www.aarp.org/health/conditions-treatments/info-2020/coronavirus-deaths-older-adults.html is well-written and informative except for not giving any numbers specifying the change in survival rate when a comorbidity is added.
The article starts with the following statement: "In a pandemic filled with grim statistics, one of the grimmest has gone largely unnoticed: 95 percent of COVID-19 deaths in the U.S. have occurred among people who were 50 or older. This even though the majority of coronavirus cases have been reported in people under age 50."
Nothing about what percentage of covid deaths were of people above fifty who were free of comorbidities.
It has an interesting list but it's only qualitative:
"People with the following conditions are at increased risk for severe illness from COVID-19, the CDC says:
Cancer Chronic kidney disease Chronic lung diseases, including COPD (chronic obstructive pulmonary disease), asthma (moderate to severe), interstitial lung disease, cystic fibrosis and pulmonary hypertension Dementia or other neurological conditions Diabetes (type 1 or type 2) Down syndrome Heart conditions (such as heart failure, coronary artery disease, cardiomyopathies or hypertension) HIV infection Immunocompromised state (weakened immune system) Liver disease Overweight and obesity (defined as a body mass index of 25 or greater) Pregnancy Sickle cell disease or thalassemia Smoking, current or former Solid organ or blood stem cell transplant (includes bone marrow transplants) Stroke or cerebrovascular disease, which affects blood flow to the brain Substance use disorders (such as alcohol, opioid or cocaine use disorder) Source: CDC"
And I've not been able to find out anything about this anywhere.