title: [The validity and reliability of the Spanish version of the Severe Cognitive Impairment Profile (SCIP) for the cognitive assessment of persons with advanced stages of Alzheimer's disease].
abstract: BACKGROUND
  Few validated tools exist in Spanish for conducting a precise assessment of the cognitive functioning of persons with advanced dementia. This population is a challenge due to the large number of persons who reach these states and owing to the complexity of the care that they require. This study presents a validated Spanish version of an instrument, the Severe Cognitive Impairment Profile (SCIP), which allows assessment of the cognitive functioning of persons with advanced Alzheimer's disease.
  
  
  METHODS
  We conducted a cross-sectional study with 133 subjects (29 males and 104 females; mean age: 81.61 ± 7.41 years) diagnosed with Alzheimer's disease in moderate to very severe stages, according to the Global Deterioration Scale (GDS 5-7). The following were performed: discrimination analyses of the items, a study of the internal consistency and interrater reliability and test-retest. Likewise, the factorial structure and the validity of the instrument were also tested.
  
  
  RESULTS
  Only 1% of the 160 items on the scale were found to be non-discriminatory. The internal consistency of the scale is adequate, as is the interrater and the test-retest reliability. As regards the validity of the construct, the correlation with the mini-mental state examination is 0.74 (p < 0.01) and significant differences are found between the SCIP and the three levels of the GDS that were analysed. The factorial structure of the scales shows the existence of a single factor that accounts for 66.12% of the variance.
  
  
  CONCLUSIONS
  The SCIP scale is a useful, reliable and valid instrument for the exhaustive evaluation in Spanish of the cognitive functions of persons with dementia in moderate to very severe states.
authors.affiliation: Centro Gerontologico Rezola, Matia Fundazioa, Donostia-San Sebastian, Espana.
authors.forename: C
authors.initials: C
authors.lastname: Buiza
authors.forename: I
authors.initials: I
authors.lastname: Montorio-Cerrato
authors.forename: J
authors.initials: J
authors.lastname: Yanguas
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000150:complications*; D003072:Cognition Disorders / Q000209:etiology*; D003430:Cross-Sectional Studies; D018450:Disease Progression; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D011594:Psychometrics; D015203:Reproducibility of Results; D012720:Severity of Illness Index