Scoring
The IQCODE is generally scored by averaging the ratings across the 26 situations. A person who has no cognitive decline will have an average score of 3, while scores of greater than 3 indicate that some decline has occurred. However, some users of the IQCODE have scored it by summing the scores to give a range from 26 to 130.
Various cutoff scores have been used to distinguish dementia from normality. In community samples, cutoff scores for likely dementia have ranged from 3.3 and above to 3.6 and above, while in patient samples the cutoff scores have ranged from 3.4 and above to 4.0 and above.
To improve the detection of dementia, the IQCODE can be used in combination with the Mini-Mental State Examination. A graphical method of combining the two tests has been developed and is known as the Demegraph.
Read more about this topic: Informant Questionnaire On Cognitive Decline In The Elderly