title: Can IQCODE detect poststroke dementia?
abstract: BACKGROUND
  Little is known about the performance of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) in the screening of post-stroke dementia (PSDE).
  
  
  METHODS
  At 3 months after the index stroke, a research assistant administered the IQCODE to relatives of 189 Chinese patients with acute stroke who were consecutively admitted to a general hospital. A psychiatrist, who was blind to the IQCODE scores, interviewed all 189 patients and made DSM-IV diagnosis of dementia, which served as the benchmark for judging the performance of IQCODE in screening PSDE.
  
  
  RESULTS
  The optimal cut-off point of IQCODE was 3.40. The sensitivity, specificity, and positive and negative predictive values of IQCODE, and the area under the receiver operating characteristic curve, were 88%, 75%, 33%, 98%, and 0.88, respectively.
  
  
  CONCLUSIONS
  When used as a sole instrument, IQCODE does not appear to be useful in screening PSDE in Chinese elderly.
authors.affiliation: Department of Psychiatry, Chinese University of Hong Kong, Hong Kong, SAR, China. tangwk@cuhk.edu.hk
authors.forename: Wai Kwong
authors.initials: WK
authors.lastname: Tang
authors.forename: Sandra S M
authors.initials: SS
authors.lastname: Chan
authors.forename: Helen F K
authors.initials: HF
authors.lastname: Chiu
authors.forename: Ka Sing
authors.initials: KS
authors.lastname: Wong
authors.forename: Timothy C Y
authors.initials: TC
authors.lastname: Kwok
authors.forename: Vincent
authors.initials: V
authors.lastname: Mok
authors.forename: Gabor S
authors.initials: GS
authors.lastname: Ungvari
mesh_terms: D000368:Aged; D015140:Dementia, Vascular / Q000175:diagnosis* / Q000209:etiology; D005260:Female; D015577:Geriatric Assessment / Q000379:methods; D006801:Humans; D008297:Male; D011569:Psychiatric Status Rating Scales / Q000592:standards*; D012372:ROC Curve; D012680:Sensitivity and Specificity; D020521:Stroke / Q000150:complications / Q000523:psychology*; D011795:Surveys and Questionnaires / Q000592:standards*