title: Italian norms for the Freedman version of the Clock Drawing Test.
abstract: BACKGROUND
  The Clock Drawing Test (CDT) is a valid screening tool for the evaluation of cognitive decline. This study aimed to compute standardized norms for the Freedman version of the CDT in a population of 248 healthy Italian individuals aged from 20 to 89 years.
  
  
  METHODS
  The effects of age, education, and gender on performance were assessed. Three conditions were administered: free-drawn clock (FD), which required participants to draw the contour, numbers, hands, and center of the clock; predrawn clock (PD), in which numbers, hands, and center had to be included in a predrawn contour; examiner-drawn clock (ED), in which only hands and center had to be inserted in a template including a predrawn contour and numbers. Scores for each of the single conditions and a total score were calculated.
  
  
  RESULTS
  Age had no effect on the FD condition, whereas a significant effect of age was found for the PD and ED conditions and the total score. Gender and education had no influence on any of the scores. Correction grids, cutoffs, and equivalent scores were computed.
  
  
  CONCLUSIONS
  Standardized norms for the Freedman version of the CDT were collected in a large sample of healthy individuals. No adjustments were required for scores on the free-drawn condition, whereas raw scores on the predrawn and examiner-drawn conditions and the total score needed adjustments to account for age effects. The availability of standardized norms for this version of the CDT could increase the use of this comprehensive tool in the detection of dementia.
authors.affiliation: Department of Neuroscience, University of Parma, Parma, Italy. paolo.caffarra@unipr.it
authors.forename: Paolo
authors.initials: P
authors.lastname: Caffarra
authors.forename: Simona
authors.initials: S
authors.lastname: Gardini
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Zonato
authors.forename: Letizia
authors.initials: L
authors.lastname: Concari
authors.forename: Francesca
authors.initials: F
authors.lastname: Dieci
authors.forename: Sandra
authors.initials: S
authors.lastname: Copelli
authors.forename: Morris
authors.initials: M
authors.lastname: Freedman
authors.forename: Andrea
authors.initials: A
authors.lastname: Stracciari
authors.forename: Annalena
authors.initials: A
authors.lastname: Venneri
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D003071:Cognition / Q000502:physiology*; D005260:Female; D006801:Humans; D007558:Italy; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests / Q000592:standards*; D011597:Psychomotor Performance; D012016:Reference Values; D012044:Regression Analysis; D055815:Young Adult