The test-retest reliability of the A-ADAS-Cog was stable over time (r = 0.97). The results showed that the A-ADAS-Cog has good internal consistency and reliability (α= 0.82 for AD). A correction table was constructed to control these effects. The A-ADAS-Cog scores were significantly affected by age and education. The A-ADAS-Cog), an Arabic version of the Mini-Mental State Examination (A-MMSE), and a Standardized Clinical Dementia Rating Scale (CDR) were administered to three Tunisian groups: 124 normal controls (NC), 33 patients with non-Alzheimer dementia (N-AD), and 25 patients with Alzheimer's disease (AD). The aim of the present study was to develop an Arabic version of this scale (A-ADAS-Cog), examine its psychometric properties (reliability and validity), and provide normative data. The Alzheimer's Disease Assessment Scale's cognitive subscale (ADAS-Cog) is the most widely used instrument for screening cognitive dysfunction in Alzheimer's disease.
