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The Clock Reading Test: validation of an instrument for the diagnosis of dementia and disorders of visuo-spatial cognition.
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Abstract
The 12-item Clock Reading Test (CRT) allows a fine-graded assessment of clock-reading ability. It has a strong focus on visuo-spatial processing and requires no executive processing. This study evaluated the reliability, validity, sensitivity and specificity of the CRT for the diagnosis of dementia and visuo-spatial dysfunction.