I think asking IQ would only make sense in a rambling conversation with a very close friend or family member.
Asking for it to screen people for any official or semi-official purpose would seem wrong, might be illegal (it is medical info, right?), and would not be useful.
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-They might lie.
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-Different IQ tests have different standard deviations...you can get a different score from different tests.
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-Some "IQ" tests might not be reliable (for instance, one you found and took on the Internet, or in a magazine).
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-There are medical reasons a person's IQ might get lower after they have taken a test (for instance, a stroke).
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-I can tell you from personal experience
this Dilbert cartoon is correct.
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-IQ does not equate education, training, talent, integrity, etc.
I think it is considered medical information as it’s you brain. Your iq is like testing your blood for diseases. Mental health is about your feelings, intellectually health is about your brain ability and cognition and it’s functions aka dementia is a brain disorder that destroys brain cells that would contribute to lowering iq. I don’t know why someone would lie about their iq? If they did it would easily be seen as lie when you ask their education and which uni they go to. Oh no I mean those magazine iqs aren’t valid, I mean like everyone has to get a proper iq test by a neuroscientist or educational psychologist like they do for some others jobs you have to get a full psych screening to see if you can handle the job.