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Seems Wikipedia agrees, so that's something:

https://en.wikipedia.org/wiki/Fold_change

In which case a 60% increased probability is a very significant increase. Seems like a valid thing to test for when assessing someone for long COVID, given it still remains somewhat of a diagnosis of exclusion.

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it's a relative risk, and the underlying absolute risk was very small, so even if 60% sounds big, testing everybody isn't the right solution.

IIRC the absolute risk of long Covid is 7-15% per infection, which is anything but very small.

if that's true, and people get reinfected periodically, then basically everybody will have long covid :)

but not really. what you're seeing is that some fraction of the populace is susceptible to long covid (risk factor or genetic).

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