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Alzheimer's Disease: (Davous et al, 1987; n = 133; mean age = 64.5 (range = 37 to 91) years; multiple diagnosis)

• >10 indicates cognitive impairment

• Sensitivity = 88%
• Specificity = 94%
• False positive = 11%
• False negative = 5%

Alzheimer's Disease: (Davous et al, 1987) 

Alzheimer's: (Fuld, 1978; n = 18 patients)

• Retesting 3 weeks after the initial assessment resulted in a score within 4 points of the original score.

Alzheimer's Disease: (Davous et al, 1987)

• OMCT appeared equivalent to the Mini Mental State Examination in identifying dementia

Alzheimer's: (Davous et al, 1987; n =  21 patients during the same week as the mental status evaluation by a trained psychologist blind to OMCT results)

• Adequate: Wechsler Memory Scale (Pearson r = - 0.562, p < 0.01)
• Adequate: Progressive Matrices; Raven PM47 (Spearman r = 0.590, p < 0.01)

Various Neurological Diseases: (Wade & Vergis, 1998; n = 38; mean age = 47.1 (11.4) years)

• improvement greater than 6 points were found to indicate a real improvement in memory
• deterioration of more than 2 points represented real declines

Nursing home patients: (Katzman 1983; n = 170, demographic details not indicated)

• Excellent correlations with the full Blessed test (r = 0.941)
• In a separate sample composed of patients suffering from dementia; 81 % of the population had scores within +/- 4 of total Blessed scores

Various Neurological Diseases: (Wade & Vergis, 1998)

• No clinically significant differences between OMC scores and Barthel ADL scores (Pearson¡¯s r = 0.23)

Stepwise regression of the 26 item Blessed measure revealed 5 items with high item-total correlations. These items were then used to create the final 6 item measure.