Journals of Gerontology Series B: Psychological Sciences and Social Sciences, Vol 53, Issue 6 P353-P357, Copyright © 1998 by The Gerontological Society of America
Clock-face drawing, reading and setting tests in the screening of dementia in Chinese elderly adults
LC Lam, HF Chiu, KO Ng, C Chan, WF Chan, SW Li and M Wong
Department of Psychiatry, Chinese University of Hong Kong. [email protected]
Comprehensive neuropsychological batteries focus on the subtle cognitive
deficits in dementia, but a brief screening instrument is also of immense
practical value. As the clock-drawing test encompasses a number of
cognitive domains frequently disturbed by the dementing process, it is
considered to be a suitable screening instrument for the disorder. We
documented the usefulness of a new scoring method of the clock-drawing test
for screening of dementia in the elderly Chinese in Hong Kong. Fifty-three
demented individuals and 53 healthy elderly controls were assessed. At a
cutoff score of 3/4, the sensitivity and specificity of the clock-drawing
test in screening of dementia was 83% and 79%. With a composite test of
clock reading and clock setting, the positive predictive value of the clock
face test was 98%. This new scoring method of clock-drawing proved to be a
valid measure for screening of dementia. It is applicable in non-English
speaking populations and should be a useful adjunct for quick screening
assessment of dementia.
