title: Measurement properties of the CLOX Executive Clock Drawing Task in an inpatient stroke rehabilitation setting.
abstract: OBJECTIVE
  The goal of this study was to explore the psychometric properties of the CLOX Executive Clock Drawing Task (Royall, Cordes, & Polk, 1998) in persons who had sustained a stroke and were receiving inpatient rehabilitation.
  
  
  METHODS
  Rasch modeling was utilized to examine the psychometric properties of the CLOX. Separate analyses were conducted for the free draw (CLOX 1) and copy (CLOX 2) portions of the measure to investigate each presentation mode independently. The sample consisted of 66 inpatient adults who had sustained a stroke.
  
  
  RESULTS
  CLOX 1 met most Rasch model expectations for item fit, unidimensionality, test reliability, and sample targeting. CLOX 2 was less psychometrically sound and contained two items with significant misfit. CLOX 2 demonstrated a significant ceiling effect that resulted in poor sample targeting.
  
  
  CONCLUSIONS
  CLOX 1 is a psychometrically sound screening instrument for assessing persons with stroke receiving inpatient rehabilitation. In addition to the psychometric weaknesses of CLOX 2, its interpretive yield is minimal and clinicians may consider omitting it. Recommendations are made for using the Rasch item-person maps in clinical practice.
authors.affiliation: Department of Neuropsychology and Rehabilitation Psychology, Rehabilitation Institute of Michigan, Detroit, Michigan, USA.
authors.forename: Virginia
authors.initials: V
authors.lastname: Zuverza-Chavarria
authors.forename: John
authors.initials: J
authors.lastname: Tsanadis
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D056344:Executive Function; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008432:Mathematical Computing; D008875:Middle Aged; D009483:Neuropsychological Tests / Q000706:statistics & numerical data*; D010468:Perceptual Disorders / Q000523:psychology / Q000534:rehabilitation; D011594:Psychometrics / Q000706:statistics & numerical data; D012047:Rehabilitation Centers; D015203:Reproducibility of Results; D020521:Stroke / Q000523:psychology; D000071939:Stroke Rehabilitation