Intelligence and mental illness: Let's examine the old idea that smart people are more likely to have mental problems. Nietzsche went crazy, right--among others? The GSS asked people if they have ever had a mental illness, and here are their mean IQs:
Mental illness 109.9
No mental illness 101.3
Mental Illness 100.1
No mental illness 94.4
For blacks and whites, those reporting having had a mental illness have higher average IQs. Once again, the data presented on this blog have a way of supporting stereotypes. Now, some will inevitably claim that smart people will admit their illness while less intelligent people won't, but you must admit the differences are quite large.