Morris developed the Clinical Dementia Rating (CDR) to determine the impairment associated with dementia. The author is from Washington University in St. Louis.
Parameters:
(1) memory
(2) orientation
(3) judgment and problem solving
(4) community affairs
(5) home and hobbies
(6) personal care
Score the impairment when decline is due to cognitive loss, not impairment from other causes.
Impairment
Points
none (normal)
0
questionable
0.5
mild impairment
1
moderate impairment
2
severe impairment
3
where:
• In personal care, there is no questionable category.
• If unable to decide between 2 categories of impairment (“draw”), then select the higher impairment.
• If aphasia is present to a greater degree than the general dementia, then rate based on the general level of dementia, based on nonlanguage cognitive function.
Interpretation:
• Memory is the primary category and the other 5 are secondary.
Results
CDR Value
3 to 5 secondary categories same as M
M
1 secondary categories same as M, with 2 greater and 2 less
M
2 secondary categories same as M, with 2 greater and 1 less
M
2 secondary categories same as M, with 1 greater and 2 less
M
3 to 5 secondary categories > M
value for majority > M; if tied use value closest to M
M = 0.5 and 3 to 5 secondary categories >= 1.0
1
M = 0 and 2 to 5 secondary categories >= 0.5
0.5
3 to 5 secondary categories < M
value for majority < M; if tied use value closest to M
3 to 5 secondary categories 0 and M >= 1
0.5
3 secondary categories > M and 2 categories < M
M
To read more or access our algorithms and calculators, please log in or register.
