J Korean Geriatr Soc.  2005 Sep;9(3):196-202.

Validity of the Korean Version of Informant Questionnaire on the Cognitive Decline in the Elderly(IQCODE)

  • 1Department of Neuropsychiatry, College of Medicine, Inje University Sanggye Paik Hospital, Seoul, Korea. dwlee@sanggyepaik.ac.kr
  • 2Department of Neuropsychiatry, College of Medicine, Seoul National University, Boramae Hospital, Seoul, Korea.
  • 3Department of Neuropsychiatry, College of Medicine, Hallym University, Kangdong Sacred Heart Hospital, Seoul, Korea.
  • 4Department of Psychiatry, Gachon Medical School, Incheon, Korea.
  • 5Department of Psychiatry, College of Medicine, Yonsei University, Seoul, Korea.


This study was conducted to prove the validity of the Korean version of the Informant Questionnaire on Cognitive Decline in the Elderly(IQCODE-K) as a screening test for Alzheimer's disease. METHOD: Informants of the elderly who visited the dementia clinic and the elderly living in community, were asked to complete IQCODE-K. Based on the final clinical diagnoses, performance of the the IQCODE-K in screening Alzheimer's disease was evaluated
The IQCODE is showed high internal consistency and test-retesr reliability. Optimal cut-off score of IQCODE-K was 3.6, and the sensitivity and specificity at that score were 0.90 and 0.79.
IQCODE-K is probably very useful to screen Alzheimer's disease. It may be also useful for the less well-educated people.


Alzheimer's disease; IQCODE; MMSE
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