Intelligence in early adulthood and subsequent hospitalization for mental disorders
Intelligence in early adulthood and subsequent hospitalization for mental disorders
Background: lower intelligence is a risk factor for several specific mental disorders. It is unclear whether it is a risk factor for all mental disorders, and whether it might be associated with illness severity. We examined the relation of premorbid intelligence with risk of hospital admission and with total admission rates, for the whole range of mental disorders
Methods: participants were 1,049,663 Swedish men who took tests of intelligence on conscription into military service and were followed up with regard to hospital admissions for mental disorder, for a mean of 22.6 years. International Classification of Diseases diagnoses were recorded at discharge from the hospital
Results: risk of hospital admission for all categories of mental disorder rose with each point decrease in the 9-point IQ score. For a standard deviation decrease in IQ, age-adjusted hazard ratios (95% confidence interval) were 1.60 for schizophrenia (1.55–1.65), 1.49 for other nonaffective psychoses (1.45–1.53), 1.50 for mood disorders (1.47–1.51), 1.51 for neurotic disorders (1.48–1.54), 1.60 for adjustment disorders (1.56–1.64), 1.75 for personality disorders (1.70–1.80), 1.75 for alcohol-related (1.73–1.77), and 1.85 for other substance-use disorders (1.82–1.88). Lower intelligence was also associated with greater comorbidity. Associations changed little on adjustment for potential confounders. Men with lower intelligence had higher total admission rates for mental disorders, a possible marker of clinical severity
Conclusions: lower intelligence is a risk factor for the whole range of mental disorders and for illness severity
70-77
Gale, Catherine R.
5bb2abb3-7b53-42d6-8aa7-817e193140c8
Batty, G. David
605ce199-493d-4238-b9c8-a2c076672e83
Tynelius, Per
ac8bf45c-361b-4ae5-b4a1-234610c39cbd
Deary, Ian J.
027158ae-fbfb-40ea-98b1-32d2690499ac
Rasmussen, Finn
3ae452ae-94b8-4bd3-b54f-dd96518a8404
January 2010
Gale, Catherine R.
5bb2abb3-7b53-42d6-8aa7-817e193140c8
Batty, G. David
605ce199-493d-4238-b9c8-a2c076672e83
Tynelius, Per
ac8bf45c-361b-4ae5-b4a1-234610c39cbd
Deary, Ian J.
027158ae-fbfb-40ea-98b1-32d2690499ac
Rasmussen, Finn
3ae452ae-94b8-4bd3-b54f-dd96518a8404
Gale, Catherine R., Batty, G. David, Tynelius, Per, Deary, Ian J. and Rasmussen, Finn
(2010)
Intelligence in early adulthood and subsequent hospitalization for mental disorders.
Epidemiology, 21 (1), .
(doi:10.1097/EDE.0b013e3181c17da8).
Abstract
Background: lower intelligence is a risk factor for several specific mental disorders. It is unclear whether it is a risk factor for all mental disorders, and whether it might be associated with illness severity. We examined the relation of premorbid intelligence with risk of hospital admission and with total admission rates, for the whole range of mental disorders
Methods: participants were 1,049,663 Swedish men who took tests of intelligence on conscription into military service and were followed up with regard to hospital admissions for mental disorder, for a mean of 22.6 years. International Classification of Diseases diagnoses were recorded at discharge from the hospital
Results: risk of hospital admission for all categories of mental disorder rose with each point decrease in the 9-point IQ score. For a standard deviation decrease in IQ, age-adjusted hazard ratios (95% confidence interval) were 1.60 for schizophrenia (1.55–1.65), 1.49 for other nonaffective psychoses (1.45–1.53), 1.50 for mood disorders (1.47–1.51), 1.51 for neurotic disorders (1.48–1.54), 1.60 for adjustment disorders (1.56–1.64), 1.75 for personality disorders (1.70–1.80), 1.75 for alcohol-related (1.73–1.77), and 1.85 for other substance-use disorders (1.82–1.88). Lower intelligence was also associated with greater comorbidity. Associations changed little on adjustment for potential confounders. Men with lower intelligence had higher total admission rates for mental disorders, a possible marker of clinical severity
Conclusions: lower intelligence is a risk factor for the whole range of mental disorders and for illness severity
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Published date: January 2010
Organisations:
Dev Origins of Health & Disease
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Local EPrints ID: 73426
URI: http://eprints.soton.ac.uk/id/eprint/73426
ISSN: 1044-3983
PURE UUID: a1a6f4de-44b3-4ec2-91a9-09dbabf0a781
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Date deposited: 09 Mar 2010
Last modified: 14 Mar 2024 02:38
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Author:
G. David Batty
Author:
Per Tynelius
Author:
Ian J. Deary
Author:
Finn Rasmussen
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