Premorbid IQ varies across different definitions of schizophrenia

Annick Urfer Parnas; Lennart Jansson; Peter Handest; Jan Nielsen; Ditte Sæbye; Josef Parnas

Premorbid IQ varies across different definitions of schizophrenia

Annick Urfer Parnas, Lennart Jansson, Peter Handest, Jan Nielsen, Ditte Sæbye, Josef Parnas

6 Citations (Scopus)

Abstract

The nature of the association between IQ and schizophrenia is still unclear. So far no study addressed this issue in relation to the breadth or scope of the very concept of schizophrenia. We examined the premorbid IQ in a polydiagnostic study with four classifications of schizophrenia: ICD-8/9, ICD-10, St. Louis and Flexible System-Wide. Only the ICD-10 schizophrenia patients exhibited a significantly lower premorbid IQ. There were suggestive differences between the four examined systems as well as between the ICD-10 paranoid and non-paranoid subtypes. Exploration of crucial diagnostic features of schizophrenia in relation to IQ revealed associations between low premorbid IQ and hallucinations as well as negative symptoms. It is concluded that premorbid IQ varies across different definitions of schizophrenia.

Original language	English
Journal	World Psychiatry
Volume	6
Issue number	1
Pages (from-to)	38-41
Number of pages	4
ISSN	1723-8617
Publication status	Published - 1 Feb 2007

Cite this

@article{a85b6012c76a4e90abf0748248da9aca,

title = "Premorbid IQ varies across different definitions of schizophrenia",

abstract = "The nature of the association between IQ and schizophrenia is still unclear. So far no study addressed this issue in relation to the breadth or scope of the very concept of schizophrenia. We examined the premorbid IQ in a polydiagnostic study with four classifications of schizophrenia: ICD-8/9, ICD-10, St. Louis and Flexible System-Wide. Only the ICD-10 schizophrenia patients exhibited a significantly lower premorbid IQ. There were suggestive differences between the four examined systems as well as between the ICD-10 paranoid and non-paranoid subtypes. Exploration of crucial diagnostic features of schizophrenia in relation to IQ revealed associations between low premorbid IQ and hallucinations as well as negative symptoms. It is concluded that premorbid IQ varies across different definitions of schizophrenia.",

author = "{Urfer Parnas}, Annick and Lennart Jansson and Peter Handest and Jan Nielsen and Ditte S{\ae}bye and Josef Parnas",

year = "2007",

month = feb,

day = "1",

language = "English",

volume = "6",

pages = "38--41",

journal = "World Psychiatry",

issn = "1723-8617",

publisher = "Wiley",

number = "1",

}

TY - JOUR

T1 - Premorbid IQ varies across different definitions of schizophrenia

AU - Urfer Parnas, Annick

AU - Jansson, Lennart

AU - Handest, Peter

AU - Nielsen, Jan

AU - Sæbye, Ditte

AU - Parnas, Josef

PY - 2007/2/1

Y1 - 2007/2/1

N2 - The nature of the association between IQ and schizophrenia is still unclear. So far no study addressed this issue in relation to the breadth or scope of the very concept of schizophrenia. We examined the premorbid IQ in a polydiagnostic study with four classifications of schizophrenia: ICD-8/9, ICD-10, St. Louis and Flexible System-Wide. Only the ICD-10 schizophrenia patients exhibited a significantly lower premorbid IQ. There were suggestive differences between the four examined systems as well as between the ICD-10 paranoid and non-paranoid subtypes. Exploration of crucial diagnostic features of schizophrenia in relation to IQ revealed associations between low premorbid IQ and hallucinations as well as negative symptoms. It is concluded that premorbid IQ varies across different definitions of schizophrenia.

AB - The nature of the association between IQ and schizophrenia is still unclear. So far no study addressed this issue in relation to the breadth or scope of the very concept of schizophrenia. We examined the premorbid IQ in a polydiagnostic study with four classifications of schizophrenia: ICD-8/9, ICD-10, St. Louis and Flexible System-Wide. Only the ICD-10 schizophrenia patients exhibited a significantly lower premorbid IQ. There were suggestive differences between the four examined systems as well as between the ICD-10 paranoid and non-paranoid subtypes. Exploration of crucial diagnostic features of schizophrenia in relation to IQ revealed associations between low premorbid IQ and hallucinations as well as negative symptoms. It is concluded that premorbid IQ varies across different definitions of schizophrenia.

M3 - Journal article

SN - 1723-8617

VL - 6

SP - 38

EP - 41

JO - World Psychiatry

JF - World Psychiatry

IS - 1

ER -

Premorbid IQ varies across different definitions of schizophrenia

Abstract

Fingerprint

Cite this