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IQCODE Scoring Methodology

Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE)

To score the IQCODE, add up the score for each question and divide by the number of questions.

For the Long IQCODE, you divide by 26. For the Short IQCODE, divide by 16.

The result is a score that ranges from 1 to 5.

A score of 3 means that the subject is rated on average as 'no change'. A score of 4 means an average of 'a bit worse'. A score of 5 an average of 'much worse'.

If the Long IQCODE is used for screening for dementia, a cutting point of 3.27/3.30 balances sensitivity and specificity.

For the Short IQCODE, a cutting point of 3.31/3.38 achieves a balance of sensitivity and specificity.

For further information on scoring and cut-points for screening, see:

Jorm, A. F. (1994). A short form of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): Development and cross-validation. Psychological Medicine, 24, 145-153.

 

Copyright 2003 Anthony Jorm