This might also be of interest- 6 types of symptom 'clusters' indicating different levels of severity, from the BMJ..
www.bmj.com/content/370/bmj.m2911
The Covid Symptom Study app was developed by King’s College London in conjunction with the health technology company ZOE and has more than 4 million users.
Users of the app are asked to log their health and any new potential symptoms of covid-19 daily. A machine learning algorithm analysed data from a subset of 1653 users of the app in the UK and US with confirmed covid-19 who had regularly logged their symptoms in March and April. Of the sample, 383 reported at least one hospital visit and 107 reported respiratory support.
The algorithm revealed six distinct groupings of symptoms. This was then tested by running it on a second independent dataset of 1000 users in the UK, US, and Sweden who had logged their symptoms in May. The six clusters are:
“Flu-like” with no fever—headache, loss of smell, muscle pains, cough, sore throat, chest pain, no fever
“Flu-like” with fever—headache, loss of smell, cough, sore throat, hoarseness, fever, loss of appetite
Gastrointestinal—headache, loss of smell, loss of appetite, diarrhoea, sore throat, chest pain, no cough
Severe level one, fatigue—headache, loss of smell, cough, fever, hoarseness, chest pain, fatigue
Severe level two, confusion—headache, loss of smell, loss of appetite, cough, fever, hoarseness, sore throat, chest pain, fatigue, confusion, muscle pain
Severe level three, abdominal and respiratory—headache, loss of smell, loss of appetite, cough, fever, hoarseness, sore throat, chest pain, fatigue, confusion, muscle pain, shortness of breath, diarrhoea, abdominal pain.