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Mattis Dementia Rating Scale: internal reliability study using a diffusely impaired population

R Gardner, S Oliver-Muñoz, L Fisher

Journal of Clinical Neuropsychology

|October 1, 1981

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The Mattis Dementia Rating Scale (MDRS) demonstrates high internal reliability for assessing cognitive deficits in older adults with diffuse cerebral impairment. This scale effectively differentiates the severity of impairment in individuals with organic mental syndrome.

Area of Science:

Neuropsychology
Geriatric Medicine
Cognitive Assessment

Background:

The Mattis Dementia Rating Scale (MDRS) was initially designed to evaluate cortical deficits in individuals with severe cognitive impairment, as indicated by low scores on the Wechsler Adult Intelligence Scale (WAIS) and Wechsler Memory Scale (WMS).
Assessing the reliability of the MDRS is crucial for its clinical application in diagnosing and managing dementia and other forms of cognitive decline.

Purpose of the Study:

To determine the internal reliability of the Mattis Dementia Rating Scale (MDRS) in patients diagnosed with diffuse cerebral impairment.
To confirm the MDRS's utility in quantifying cognitive deficits in an elderly population with organic mental syndrome.

Main Methods:

The study involved participants aged 65 to 94 years with organic brain syndrome, excluding those with localized or reversible etiological factors.

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Internal reliability of the MDRS was assessed using a split-half method, with scores analyzed via the Rulon formula.

Main Results:

The split-half reliability analysis yielded a correlation coefficient of .90, indicating strong internal consistency for the MDRS.
The MDRS proved effective in discriminating the degree of cognitive impairment among patients with organic mental syndrome.

Conclusions:

The Mattis Dementia Rating Scale (MDRS) exhibits excellent internal reliability when applied to elderly individuals with diffuse cerebral impairment.
The MDRS is a valuable tool for assessing and differentiating the severity of cognitive deficits in patients with organic mental syndrome.