title: Application study of quick cognitive screening test in identifying mild cognitive impairment.
abstract: OBJECTIVE
  To assess whether quick cognitive screening test (QCST) could quickly identify mild cognitive impairment (MCI).
  
  
  METHODS
  QCST and a full set of standardized neuropsychological tests, including mini-mental state examination (MMSE) and montreal cognitive assessment (MoCA) were performed. A total number of 121 cases of MCI [41 cases of amnestic MCI-single domain (aMCI-s); 44 of amnestic MCI-multiple domain (aMCI-m); 36 of nonamnestic MCI (naMCI)], 79 cases of mild Alzheimer's disease (AD) and 186 healthy elderly volunteers were employed in the present study. All the participants (55-85 years old) had an educational level no less than 5 years. QCST subtests included word list recall, naming test, animal fluency test, similarity test, color trail-1min, clock drawing test, finger construction test, and digit span test. The total score of QCST was 90 points, 10 points for each index of subtests.
  
  
  RESULTS
  The total scores of QCST in MCI, AD and the control groups were (58.13+/-8.18), (44.53+/-10.54) and (72.92+/-6.85) points, respectively. According to the educational level, the cut off scores of participants with an educational level of 5-8 years, 9-12 years and more than 13 years were 63, 65 and 68 points, respectively. The sensitivity and specificity of QCST in detection of MCI were 87.6% (85.7% for aMCI-s, 90.1% for aMCI-m and 89.5% for naMCI) and 84.3%, respectively. The area under the curve was 0.923 (95% CI: 0.892-0.953). Delayed memory, color trail-1min and similarity test could help distinguish between aMCI and naMCI.
  
  
  CONCLUSIONS
  QCST may have a good sensitivity and specificity for MCI detection, which warrants its further clinical application.
authors.affiliation: Department of Neurology, Shanghai Medical College, Fudan University, Shanghai 200040, China. dr.guoqihao@126.com
authors.forename: Qi-Hao
authors.initials: QH
authors.lastname: Guo
authors.forename: Xin-Yi
authors.initials: XY
authors.lastname: Cao
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhou
authors.forename: Qian-Hua
authors.initials: QH
authors.lastname: Zhao
authors.forename: Ding
authors.initials: D
authors.lastname: Ding
authors.forename: Zhen
authors.initials: Z
authors.lastname: Hong
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000175:diagnosis; D019540:Area Under Curve; D003072:Cognition Disorders / Q000175:diagnosis*; D004522:Educational Status; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D011594:Psychometrics; D012680:Sensitivity and Specificity