The risk for developing schizophrenia is significantly affected by an individual’s IQ, show results of a study of over 1 million Swedish men.
Researchers found that each 1-point decrease in IQ score was associated with a 3.8% increase in the risk of developing schizophrenia.
“The observed IQ-schizophrenia association does not, to any appreciable degree, appear to result from declines in intelligence in individuals undergoing an insidious onset of schizophrenia at the time of testing”, note Kenneth Kendler (Virginia Commonwealth University, Richmond, Virginia) and co-authors in The American Journal of Psychiatry.
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