{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T13:11:55Z","timestamp":1777381915459,"version":"3.51.4"},"reference-count":30,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[2009,4,9]],"date-time":"2009-04-09T00:00:00Z","timestamp":1239235200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Am J Alzheimers Dis Other Demen"],"published-print":{"date-parts":[[2010,3]]},"abstract":"<jats:p>Disease-specific assessments are not currently available for patients with Parkinson\u2019s disease dementia (PDD). This study evaluated the criterion-related validity and test\u2014retest reliability of the Alzheimer\u2019s Disease Assessment scale cognitive subscale (ADAS-cog) in terms of sensitivity for differentiation between mild and moderate severity impairment in PDD. Six other dementia rating scales and cognitive tests were also examined. A total of 113 patients with PDD or Alzheimer disease were recruited into this 4-week, multicenter study, segregated into 2 severity groups based on Mini-Mental State Examination (MMSE) score. Mean ADAS-cog scores showed a statistically significant separation between mild and moderate severity patients in both dementias (P &lt; .001). For the ADAS-cog, test\u2014retest Spearman correlation coefficients were significant for each dementia type and severity. This study demonstrated the criterion-related validity and test\u2014retest reliability for ADAS-cog in patients with PDD and strong correlations with MMSE. 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