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Long Covid
#1
I am not competent to evaluate this. I do not know the reputation of the Norwegian Institute of Public Health.

Given the disclaimer, this covers some of the first data I've seen covering long covid.

https://www.medrxiv.org/content/10.1101/...1.full.pdf

They look at people that got COVID (separately in two different waves). Then they compare long covid symptoms between people that didn't get covid and people that did.
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#2
Thanks! Interesting.

Somewhat disappointingly, the number of those with COVID in their study was < 1000. Enough for statistics.

You can see absolute risk and relative risk for various symptoms at 1-6 months after COIVD on page 10, 11-12 months after COVID on page 9.

Table 4 compares the longer-term symptoms (sum of 1-6 months & 11-12 months) for those with "almost no illness" versus those with moderate/severe illness. This may be of interest for Omicron. There was about twice the risk for those with moderate/severe COVID to have any particular symptom, but those with mild COVID with symptoms still had increased risk of longer-term symptoms (6.9% had shortness of breath, 10.2% had fatigue, 16% had altered smell or taste).

From the clustering of symptoms, they postulate two (unknown) factors behind the increased risk for various long-lasting symptoms. That's in table 5 on page 12. One factor would increase your risk for brain fog, memory issues, heart palpitations, fatigue, and such (altered smell/taste is associated with this factor). The other factor would increase your risk of cough, reduced lung function, and chest pain.
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