Correlations between the CDT score and other cognitive measures.

*Correlation is significant at the 0.05 level (two-tailed).**Correlation is significant at the 0.01 level (two-tailed).MMSE: Mini-Mental state examination; Rey –O CFT-Copy: copy part of Rey –O complex figure test; CFT-Recall: copy part of complex figure test; AVLT-I: immediately recall of auditory verbal learning test; AVLT-II: delayed recall of auditory verbal learning test; SCWT-C: part C of Stroop color word test; AFT: animal fluency test; STT-A: part A of shape trails test; BCCDT: based change clock drawing test.