Related Experiment Video
Updated: Aug 24, 2026
Evaluation of the Cognitive Performance of Hypertensive Patients with Silent Cerebrovascular Lesions
Published on: April 23, 2021
The executive clock drawing task (CLOX) is a poor screening test for executive dysfunction in Chinese elderly
Adrian Wong1, Vincent C T Mok, Patty Yim
1Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Shatin, Hong Kong.
Abstract:
Executive dysfunction (ED) is a prominent feature of subcortical ischemic vascular disease. A screening test for ED is lacking among Chinese. The objective of the study is to investigate the validity and reliability of a Chinese version of the Executive clock drawing task (CLOX) in screening ED among Chinese elderly patients with small subcortical infarct (SSI). The Chinese version of CLOX correlated with MMSE, CDRS I/P, and WCST perseverative errors. However, multivariate regression analysis showed that only education (R(2) change=0.22, p < 0.001 ) and MMSE (R(2) change=0.35, p < 0.001), but none of the standard executive function tests, significantly accounted for the variance in the CLOX. Test-retest (r=0.84) and inter-rater reliability (r=0.84) were high for the CLOX. Conclusions. Although the CLOX is reliable, it is not valid in detecting ED in Chinese elderly patients with SSI.
