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The Clock Drawing Test for dementia of the Alzheimer's type: A comparison of three scoring methods in a memory disorders clinic.
Int J Geriatr Psychiatry 1997; 12(6):619-27IJ

Abstract

OBJECTIVES

To examine the reliability and validity of the Clock Drawing Test when used as a cognitive screening instrument for mild to moderate dementia, and to compare different scoring mechanisms.

DESIGN

Retrospective analysis of clock drawing performance using three published scoring methods (Shulman, Sunderland and Wolf-Klein).

SETTING

Hospital-based memory disorders clinic.

PARTICIPANTS

A sample of 28 consecutive patients attending the memory clinic for assessment who were given a diagnosis of Alzheimer's disease (mild or moderate) and 28 age- and sex-matched control subjects comprising 17 memory clinic attenders found to be normal and 11 community volunteers.

MEASUREMENTS

Sensitivity and specificity of the three clock rating scales against memory clinic diagnoses of dementia using DSM-III-R; their respective interrater reliabilities; and comparisons of each with measures of cognitive impairment (the Mini-Mental State Examination and the Blessed Orientation-Information-Memory-Concentration Test), daily performance of basic and instrumental activities (the Blessed Dementia Scale) and depression (the Hamilton Rating Scale for Depression).

RESULTS

All methods of scoring the Clock Drawing Test correlated well with measures of cognitive impairment (r = 0.57-0.73) and daily performance (r = 0.38-0.48), were independent of mild depression and demonstrated high sensitivity, specificity and interrater reliability. While all clock scales identified mild to moderate dementia reasonably well, the Shulman method performed best. In screening for dementia, clock drawing proved superior to the MMSE: 24/28 vs 20/28 cases identified. When compared with the MMSE, clock drawing provided additional diagnostic discrimination, identifying 7/8 AD patients with MMSE scores = 24.

CONCLUSIONS

In a clinic population, clock drawing, especially if scored according to the Shulman scale and combined with the MMSE, is an extremely efficient test screening measure for mild to moderate dementia of the Alzheimer's type with low false negative and false positive rates. This may have implications for screening elderly populations.

Authors+Show Affiliations

University of New South Wales, Sydney, Australia.No affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

9215942

Citation

Brodaty, H, and C M. Moore. "The Clock Drawing Test for Dementia of the Alzheimer's Type: a Comparison of Three Scoring Methods in a Memory Disorders Clinic." International Journal of Geriatric Psychiatry, vol. 12, no. 6, 1997, pp. 619-27.
Brodaty H, Moore CM. The Clock Drawing Test for dementia of the Alzheimer's type: A comparison of three scoring methods in a memory disorders clinic. Int J Geriatr Psychiatry. 1997;12(6):619-27.
Brodaty, H., & Moore, C. M. (1997). The Clock Drawing Test for dementia of the Alzheimer's type: A comparison of three scoring methods in a memory disorders clinic. International Journal of Geriatric Psychiatry, 12(6), pp. 619-27.
Brodaty H, Moore CM. The Clock Drawing Test for Dementia of the Alzheimer's Type: a Comparison of Three Scoring Methods in a Memory Disorders Clinic. Int J Geriatr Psychiatry. 1997;12(6):619-27. PubMed PMID: 9215942.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The Clock Drawing Test for dementia of the Alzheimer's type: A comparison of three scoring methods in a memory disorders clinic. AU - Brodaty,H, AU - Moore,C M, PY - 1997/6/1/pubmed PY - 2000/6/20/medline PY - 1997/6/1/entrez SP - 619 EP - 27 JF - International journal of geriatric psychiatry JO - Int J Geriatr Psychiatry VL - 12 IS - 6 N2 - OBJECTIVES: To examine the reliability and validity of the Clock Drawing Test when used as a cognitive screening instrument for mild to moderate dementia, and to compare different scoring mechanisms. DESIGN: Retrospective analysis of clock drawing performance using three published scoring methods (Shulman, Sunderland and Wolf-Klein). SETTING: Hospital-based memory disorders clinic. PARTICIPANTS: A sample of 28 consecutive patients attending the memory clinic for assessment who were given a diagnosis of Alzheimer's disease (mild or moderate) and 28 age- and sex-matched control subjects comprising 17 memory clinic attenders found to be normal and 11 community volunteers. MEASUREMENTS: Sensitivity and specificity of the three clock rating scales against memory clinic diagnoses of dementia using DSM-III-R; their respective interrater reliabilities; and comparisons of each with measures of cognitive impairment (the Mini-Mental State Examination and the Blessed Orientation-Information-Memory-Concentration Test), daily performance of basic and instrumental activities (the Blessed Dementia Scale) and depression (the Hamilton Rating Scale for Depression). RESULTS: All methods of scoring the Clock Drawing Test correlated well with measures of cognitive impairment (r = 0.57-0.73) and daily performance (r = 0.38-0.48), were independent of mild depression and demonstrated high sensitivity, specificity and interrater reliability. While all clock scales identified mild to moderate dementia reasonably well, the Shulman method performed best. In screening for dementia, clock drawing proved superior to the MMSE: 24/28 vs 20/28 cases identified. When compared with the MMSE, clock drawing provided additional diagnostic discrimination, identifying 7/8 AD patients with MMSE scores = 24. CONCLUSIONS: In a clinic population, clock drawing, especially if scored according to the Shulman scale and combined with the MMSE, is an extremely efficient test screening measure for mild to moderate dementia of the Alzheimer's type with low false negative and false positive rates. This may have implications for screening elderly populations. SN - 0885-6230 UR - https://www.unboundmedicine.com/medline/citation/9215942/The_Clock_Drawing_Test_for_dementia_of_the_Alzheimer's_type:_A_comparison_of_three_scoring_methods_in_a_memory_disorders_clinic_ L2 - https://www.who.int/reproductivehealth/publications/cancers/a92126/en/ DB - PRIME DP - Unbound Medicine ER -