A short form of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): development and cross-validation.
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 premorbid 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.
Jorm
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AF
NH&MRC Social Psychiatry Research Unit, Australian National University, Canberra.
D000368:Aged / Q000523:psychology*; D003072:Cognition Disorders / Q000175:diagnosis* / Q000209:etiology*; D003704:Dementia / Q000150:complications* / Q000175:diagnosis; D004651:Employment; D015577:Geriatric Assessment; D006801:Humans; D008569:Memory Disorders / Q000175:diagnosis / Q000209:etiology; D011569:Psychiatric Status Rating Scales; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires