Table 4. Receiver operating characteristic curve areas, cut-offs, sensitivity, and specificity for the PDT, MMSE, MMSE plus the PDT and the CAMCOG between AD and NC groups.

	AUC*	Cut-off**	Sensitivity	Specificity	95% CI
PDT	0.784	≥ 5	95.2%	45.9%	0.738-0.828
MMSE	0.975	≥ 25	96%	90.2%	0.960-0.991
MMSE + PDT#	0.973	≥ 30	95.2%	90.2%	0.957-0.989
CAMCOG	0.970	≥ 78	97.6%	88.7%	0.954-0.986

PDT: Pentagon Drawing Test; MMSE: Mini-Mental State Examination; CAMCOG: Cambridge Cognitive Test; NC: normal control; AD: Alzheimer's disease;

^* p <0.001 for PDT vs MMSE and PDT vs CAMCOG;

^**cut-off for best balance between sensitivity and specificity for this sample;

^#The traditional score of 0 or 1 point for the pentagon drawing was substituted by Bourke et al. scoring scale with 0 to 6 points. Thus, MMSE total score was 35 points. 95% CI : Asymptotic 95% Confidence Interval.