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Clinical Dementia Rating (CDR) Scale

The CDR is a clinically based, semistructured interview, which rates impairment level in 6 cognitive domains: memory, orientation, judgment/problem solving, community affairs, home and hobbies, and personal care.

Clinical Dementia Rating (CDR) Scale

CDR Score Impairment
0
Healthy
0.5
Very Mild
1
Mild
2
Moderate
3
Severe
Memory No memory loss or slight in consistent forgetfulness Consistent slight forgetfulness; partial recollection of events; “benign” forgetfulness Moderate memory loss; more marked for recent events; defect interferes with everyday activities Severe memory loss; only highly learned material retained; new material rapidly lost Severe memory loss, only fragments remain
Orientation Fully orientated Fully orientated except for slight difficulty with time relationships Moderate difficulty with time relationships; may have geographic disorientation elsewhere Severe difficulty with time relationships; usually disorientated in time, often to place Orientated to person only
Judgment Problem-Solving Solves everyday problems and business affairs well; judgment good in relation to past performance Slight impairment in solving problems, similarities, differences Moderate difficulty in handling problems, similarities, differences Severely impaired in handling problems, similarities, differences Unable to make judgments or solve problems
Community Affairs Independent function at usual level in job, shopping, volunteer and social groups Slight impairment in these activities Unable to function independently at these activities, though may still be engaged in some No pretense of independent function outside home.
Appears well enough to be taken to functions outside a family home
No pretense of independent function outside home.
Appears too ill to be taken to functions outside a family home
Home & Hobbies Life at home, hobbies, intellectual interests well maintained Life at home, hobbies, intellectual interests slightly impaired Mild but definite impairment of function at home; more complicated hobbies abandoned Only simple chores preserved;very restricted interests, poorly maintained No significant function in home
Personal Care Fully capable of self-care Fully capable of self-care Needs prompting Requires assistance in hygiene, keeping of personal effects Requires much help with personal care

The Global CDR Score is useful for characterizing and tracking a patient’s level of impairment/dementia3. The Global CDR Score ranges from 0 (normal) to 3 (severe dementia).

 

References:

  1. Cummings J, Hahn-Pedersen JH, Eichinger CS, Freeman C, Clark A, Tarazona LRS, Lanctôt K. Exploring the relationship between patient-relevant outcomes and Alzheimer’s disease progression assessed using the clinical dementia rating scale: a systematic literature review. Front Neurol. 2023 Aug 17;14:1208802. [Medline]
  2. Ousset PJ, Andrieu S, Reynish E, Puel M, Vellas B. Evaluation clinique de la démence d’une cohorte de 358 patients par la version française de l’échelle CDR [Clinical evaluation of dementia in a cohort of 358 patients with the French version of the Clinical Dementia Rating (CDR) scale]. Rev Med Interne. 2003 Oct;24 Suppl 3:283s-287s. [Medline]

 

Created Sep 24, 2024

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