Comment by freehorse

I do not think IQ tests are meant or designed to measure effects from illness. We do not say that IQ drops when you are sick with the flu and have high fever that makes it hard to think. IQ does not drop when you wake up groggy in the morning up until you drink coffee. I am not sure why people use IQ here instead of referring specifically to brain fog and other symptoms of post-COVID infection. IQ does not drop when you get sick and does not increase when you get treatment. If that is the case, then it is even worse measure than it is supposed to be, because it does not measure anything remotely stable.