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A short form of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): development and cross-validation

  • A. F. Jorm (a1)

Synopsis

Data from four studies were used to assess the psychometric properties of the 26 IQCODE items. The items were assessed in terms of item–total correlations, test–retest reliabilities, correlations with indicators of current cognitive functioning and correlations with indicators of pre-morbid cognitive functioning. These data were used to develop a 16-item short form. The short form was cross-validated in a new sample using dementia/delirium diagnosis as the validity standard. It was found to perform as well as the long form.

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Corresponding author

1Address for correspondence: Dr A. F. Jorm, NH&MRC Social Psychiatry Research Unit, The Australian National University, Canberra, ACT 0200, Australia.

References

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Bowers, J., Jorm, A. F., Henderson, S. & Harris, P. (1990). General practitioners' detection of depression and dementia in elderly patients. Medical Journal of Australia 153, 192196.
Folstein, M. F., Folstein, S. E. & McHugh, P. R. (1975). ‘Mini-Mental State’: a practical method for grading the cognitive state of patients for the clinician. Journal of Psychiatric Research 12, 179198.
Goldberg, D., Bridges, K., Duncan-Jones, P. & Grayson, D. (1988). Detecting anxiety and depression in general medical settings. British Medical Journal 297, 897899.
Hanley, J. A. & McNeil, B. J. (1982). The meaning and use of the area under a receiver operating characteristic (ROC) curve. Radiology 143, 2936.
Hanley, J. A. & McNeil, B. J. (1983). A method of comparing the areas under receiver operating characteristic curves derived from the same cases. Radiology 148, 839843.
Henderson, A. S., Jorm, A. F., Mackinnon, A., Christensen, H., Scott, L. R., Korten, A. E. & Doyle, C. (1993). The prevalence of depressive disorders and the distribution of depressive symptoms in later life: a survey using draft ICD-10 and DSM-III-R. Psychological Medicine 23, 719729.
Jorm, A. F. (1992). Use of informants' reports to study memory changes in dementia. In Memory Functioning in Dementia (ed. Bäckman, L.), pp. 267282. Elsevier: Amsterdam.
Jorm, A. F. & Jacomb, P. A. (1989). The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): socio-demographic correlates, reliability, validity and some norms. Psychological Medicine 19, 10151022.
Jorm, A. F., Scott, R. & Jacomb, P. A. (1989). Assessment of cognitive decline in dementia by informant questionnaire. International Journal of Geriatric Psychiatry 4, 3539.
Jorm, A. F., Scott, R., Cullen, J. S. & Mackinnon, A. J. (1991). Performance of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) as a screening test for dementia. Psychological Medicine 21, 785790.
Jorm, A. F., Christensen, H., Henderson, A. S., Korten, A. E., Mackinnon, A. J. & Scott, R. (1994). Complaints of cognitive decline in the elderly: comparison of reports by subjects and informants in a community survey. Psychological Medicine (in the press).
Mackinnon, A., Christensen, H., Cullen, J. S., Doyle, C. J., Henderson, A. S., Jorm, A. F., Korten, A. E. & Scott, L. R. (1993). The Canberra Interview for the Elderly: Assessment of its validity in the diagnosis of dementia and depression. Acta Psychiatrica Scandinavica 87, 146151.
Nelson, H. E. (1982). National Adult Reading Test (NART). NFER-Nelson: Windsor.
Social Psychiatry Research Unit (1992). The Canberra Interview for the Elderly (CIE): A new field instrument for the diagnosis of dementia and depression by ICD-10 and DSM-III-R. Acta Psychiatrica Scandinavica 85, 105113.
Weingartner, H., Cohen, R. M., Murphy, D. L., Mastello, J. & Gerdt, C. (1981). Cognitive processes in depression. Archives of General Psychiatry 38, 4247.

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