von Gunten Armin, Ostos-Wiechetek Marzanna, Brull Juliette, Vaudaux-Pisquem Ines, Cattin Sylvie, Duc René
Service Universitaire, Département de Psychiatrie, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.
Eur Neurol. 2008;60(2):73-8. doi: 10.1159/000131895. Epub 2008 May 15.
The main objective was to assess the relative frequency and types of errors on the clock-drawing test (CDT) in normal elderly subjects, and the dependence of their CDT performance upon their age and education.
The CDT performance of 242 normal elderly subjects, stratified according to age and education, was analyzed using both an absolute error count and a modified scoring sheet derived from 2 scales.
Normal elderly subjects (average age: 73.4 +/- 8.4 years; mean Mini-Mental State Examination score: 27.7 +/- 1.6) often have problems placing figures on the clock face and differentiating the clock hands correctly. The absolute number of errors increases with age and decreases with formal school education. A cumulative effect of both high age and a low level of school education yields substantially inferior scores, on the modified scale used, in comparison with younger subjects and those with higher levels of education.
The frequent errors made by normal elderly subjects, and a combined negative influence of high age and low education level, suggest caution when interpreting the significance of CDT performance in the elderly.
主要目的是评估正常老年受试者在画钟试验（CDT）中错误的相对频率和类型，以及他们的CDT表现与其年龄和教育程度的相关性。
使用绝对错误计数和源自两个量表的改良评分表，对242名根据年龄和教育程度分层的正常老年受试者的CDT表现进行分析。
正常老年受试者（平均年龄：73.4±8.4岁；简易精神状态检查表平均得分：27.7±1.6）在将数字放置在钟面上以及正确区分时针和分针方面经常存在问题。错误的绝对数量随年龄增长而增加，随正规学校教育程度降低而减少。与年轻受试者和教育程度较高的受试者相比，高龄和低教育水平的综合影响导致在使用的改良量表上得分明显较低。
正常老年受试者频繁出现错误，以及高龄和低教育水平的综合负面影响，提示在解释老年受试者CDT表现的意义时应谨慎。
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