Table 3: Clinical and cognitive features between lower and higher cognitive group. The frequency of SPD and CD errors was significantly common in the lower cognitive group

		Lower cognitive group (n=286)	Higher cognitive group (n=218)	p-value
Age (yrs)		70.55	63.97	0.00
Female (%)		151 (52.8%)	116 (53.2%)	ns
Education		7.8 ± 4.3	10.1 ± 4.1	0.00
Mean K-MMSE scores		24.7 ± 0.8	28.1 ± 1.0	0.00
Mean 3MS scores		74.8 ± 7.5	87.3 ± 6.4	0.00
Mean CDT score		7.1 ± 3.0	8.6 ± 2.0	0.00
Mean CDT time		62.1 ± 28.1	48.0 ± 28.5	0.00
Error type (%)	SBR	24.1	29	ns
	CD	53.8	41.9	0.00
	SPD	76.6	67.7	0.00
	PE	8.9	25.8	ns

Yrs: years; K-MMSE: Korean version of the Mini-Mental State Examination, 3MS: Modified Mini-Mental State (3MS) test, CDT: Clock Drawing Test, SBR: Stimulus-bound Response, CD: Conceptual Deficit, SPD: Spatial and/or Planning Deficit, PE: Perseveration Error, ns: no significance.