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. 1997 Apr;12(4):462-5.
doi: 10.1002/(sici)1099-1166(199704)12:4<462::aid-gps510>3.0.co;2-q.

Differentiating between demented and psychiatric patients with the Dutch version of the IQCODE

J F de Jonghe  1
Affiliations

Differentiating between demented and psychiatric patients with the Dutch version of the IQCODE

J F de Jonghe. Int J Geriatr Psychiatry. 1997 Apr.

Abstract

This study presents psychometric data on the Dutch version of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE-N). We focused on differentiating between inpatients with dementia or a mood/psychotic disorder. A cutoff point of 3.9 on the IQCODE-N correctly predicted group membership in 87.8% and 78.8% respectively. Internal consistency and principal component analysis suggest that the IQCODE-N measures a unidimensional construct. Correlations with a Dementia Screening Test (r = 0.62), nurses' observations on memory disorders (r = 0.71) and a global assessment of severity of dementia (r = 0.72) support the validity of the informant ratings. Patients' age and level of education did not confound informant ratings. Only a small fraction of the informants could not complete the IQCODE-N, which makes it an easily applicable rating scale for cognitive decline.

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