Table 1: Demographic features of the total patients

Variables	Values (n=504)
Age (yrs)	71.5 ± 8.7
Female (%)	267 (51.5%)
Education(yrs)	8.8 ± 4.4
Mean K-MMSE scores	26.1 ± 1.9
Mean 3MS scores	80.2 ± 9.3
Mean CDT scores	7.8 ± 2.7
Mean CDT time	56.0 ± 29.1

Yrs: years; K-MMSE: Korean version of the Mini-Mental State Examination; 3MS: Modified Mini-Mental State (3MS) test; CDT: Clock Drawing Test.