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the claim

Schizophrenia is associated with lower average IQ scores.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
7 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that schizophrenia is associated with lower average IQ scores?

Yes. Multiple peer-reviewed sources, including a large Swedish national sample and a 2002 study, report that schizophrenia is consistently associated with lower IQ compared with controls, and an umbrella review finds lower cognitive functioning in people with schizophrenia.

Verdict: SUPPORTED · 7 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 7
Low IQ scores in schizophrenia
2002
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Low IQ scores in schizophrenia. (2002). research.rug.nl. https://research.rug.nl/en/publications/9a61e331-f7f3-48e6-aaf4-00c08e628af9

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More for · 6
Low IQ scores in schizophrenia: primary or secondary deficit?
2002
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Low IQ scores in schizophrenia: primary or secondary deficit?. (2002). doi.org. https://doi.org/10.1034/j.1601-5215.2002.140302.x

Central and non‐central networks, cognition, clinical symptoms, and polygenic risk scores in schizophrenia
2017
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Central and non‐central networks, cognition, clinical symptoms, and polygenic risk scores in schizophrenia. (2017). doi.org. https://doi.org/10.1002/hbm.23798

M166. THE EFFECT OF INTELLIGENCE AND EDUCATIONAL ATTAINMENT ON THE BRAIN IN THOSE WITH FAMILIAL HIGH RISK FOR SCHIZOPHRENIA OR BIPOLAR DISORDER: AN ENIGMA–RELATIVES STUDY
2020
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Zwarte, S. D. d., Brouwer, R., Kahn, R., Turner, J., Erp, T. V. v., Andreasen, O. A., Ching, C., Jahanshad, N., Thompson, P., & Haren, N. V. v. (2020). M166. THE EFFECT OF INTELLIGENCE AND EDUCATIONAL ATTAINMENT ON THE BRAIN IN THOSE WITH FAMILIAL HIGH RISK FOR SCHIZOPHRENIA OR BIPOLAR DISORDER: AN ENIGMA–RELATIVES STUDY. doi.org. https://doi.org/10.1093/schbul/sbaa030.478

Cognitive impairment in people with schizophrenia: an umbrella review.
2022
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Gebreegziabhere, Y., Habatmu, K., Mihretu, A., Cella, M., & Alem, A. (2022). Cognitive impairment in people with schizophrenia: an umbrella review.. doi.org. https://doi.org/10.1007/s00406-022-01416-6

IQ and Schizophrenia in a Swedish National Sample: Their Causal Relationship and the Interaction of IQ with Genetic Risk -
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IQ and Schizophrenia in a Swedish National Sample: Their Causal Relationship and the Interaction of IQ with Genetic Risk - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.1176/appi.ajp.2014.14040516

Early cognitive development and psychopathology in children at familial high risk for schizophrenia
2024
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Stephens, R. L., Leavitt, I., Cornea, E., Jarskog, L., & Gilmore, J. H. (2024). Early cognitive development and psychopathology in children at familial high risk for schizophrenia. doi.org. https://doi.org/10.1016/j.schres.2024.07.034

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