Premorbid performance IQ deficit in schizophrenia
Article first published online: 24 DEC 2001
Acta Psychiatrica Scandinavica
Volume 102, Issue 6, pages 414–422, December 2000
How to Cite
Amminger, G. P., Schlögelhofer, M., Lehner, T., Looser Ott, S., Friedrich, M. H. and Aschauer, H. N. (2000), Premorbid performance IQ deficit in schizophrenia. Acta Psychiatrica Scandinavica, 102: 414–422. doi: 10.1034/j.1600-0447.2000.102006414.x
- Issue published online: 24 DEC 2001
- Article first published online: 24 DEC 2001
- Accepted for publication June 19, 2000
- Cited By
- longitudinal studies;
- risk factors;
- Wechsler scales
Objective: Performance IQ (PIQ) is often lower than verbal IQ (VIQ) in schizophrenic patients. Whether PIQ<VIQ precedes psychotic symptoms in schizophrenia remains uncertain.
Method: We investigated premorbid IQ scores in 63 subjects assessed at a child and adolescent psychiatric unit (mean age 13.1 years, SD 3.2), who at follow-up in adulthood (mean age 30.9 years, SD 3.9) received a lifetime RDC diagnosis of schizophrenia-related psychosis, affective disorder, or no psychiatric disorder.
Results: Premorbid PIQ<VIQ significantly differentiated the groups with schizophrenia-related psychosis and no psychiatric disorder. Subjects with schizophrenia-related psychosis had a significantly lower mean value for premorbid PIQ, but not VIQ, compared to subjects who developed affective disorder or subjects without psychiatric disorder.
Conclusion: Our results emphasize premorbid intellectual deficits in schizophrenia. Those deficits might largely be in consequence of an impairment on the PIQ scale.