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Longitudinal changes in clock drawing test (CDT) performance before and after cognitive decline.

Ping Wang1, Langfeng Shi1, Qianhua Zhao1

  • 1Department of Neurology, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China.

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|May 31, 2014
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Summary
This summary is machine-generated.

A new scoring system for the clock-drawing test (CDT) effectively identifies cognitive decline. This simplified method, the based change clock drawing test (BCCDT), offers a reliable tool for longitudinal cognitive function evaluation.

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Area of Science:

  • Neurology
  • Gerontology
  • Cognitive Science

Background:

  • Existing clock drawing test (CDT) scoring systems lack reliability for tracking longitudinal cognitive changes.
  • There is a need for a simple, optimal scoring procedure to evaluate cognitive decline in clinical settings.

Purpose of the Study:

  • To develop a simplified and optimal scoring procedure for the clock-drawing test to assess cognitive decline.
  • To create a reliable method for evaluating longitudinal changes in cognitive function using a clinic-based sample.

Main Methods:

  • Analyzed clock drawings from 121 participants using t-tests to identify significant changes.
  • Developed a new scoring system based on seven critical items differentiating initial and follow-up visits.
  • Compared the new scoring method, the based change clock drawing test (BCCDT), with existing systems.

Main Results:

  • Identified seven critical items significantly differentiating cognitive changes over time: number spacing, number presence, clockwise orientation, number accuracy, constant distance between numbers, presence of two hands, and arrow drawing.
  • The proposed BCCDT demonstrated balanced sensitivity and specificity compared to traditional scoring methods in a clinic-based sample.

Conclusions:

  • The novel CDT scoring system (BCCDT) offers a simple and reliable method for follow-up studies assessing cognitive decline.
  • This system can aid in evaluating the efficacy of interventions for cognitive impairment.