Table 2.

Cut-off score on the Mini Mental State Examination obtained from coordinates of the ROC curve, and corresponding sensitivity, specificity, Positive Predictive Value (PPV) and Negative Predictive Value (NPV).

Sample	Cutoffs	Area under the curve	Sensitivity(CI 95%)	Specificity(CI 95%)	PPV(CI 95%)	NPV(CI 95%)
Total	20	0.918 (0.892-0.945)	72 (64-78)	96 (94-97)	78 (70-84)	94 (93-96)
	21		78 (72-84)	92 (90-94)	66 (60-73)	95 (94-97)
	22		83 (77-88)	85 (83-87)	53 (47-59)	96 (95-97)
	23		86 (81-91)	83 (79-85)	50 (44-55)	97 (95-98)
	24		89 (84-94)	74 (71-77)	41 (36-46)	97 (96-98)
	25		91 (86-94)	63 (60-67)	33 (29-38)	97 (95-98)
Illiterate	20	0.955 (0.904-1.000)	87 (65-97)	93 (84-98)	76 (54-92)	96 (89-99)
	21		93 (73-99)	82 (41-91)	58 (39-76)	98 (91-99)
	22		93 (73-99)	74 (61-84)	48 (31-66)	98 (89-99)
	23		93 (73-99)	68 (56-79)	44 (28-60)	97 (89-99)
	24		100 (83-100)	63 (50-75)	42 (27-58)	100 (92-100)
	25		100 (83-100)	49 (36-62)	34 (21-48)	100 (90-100)
Lower education	20	0.911 (0.868-0.953)	75 (65-84)	93 (90-96)	72 (62-81)	94 (91-96)
	21		82 (72-89)	88 (85-92)	62 (53-71)	95 (93-97)
	22		87 (78-93)	82 (78-86)	53 (44-62)	96 (94-98)
	23		89 (81-95)	76 (72-81)	47 (39-55)	97 (94-99)
	24		92 (85-97)	64 (57-67)	36 (29-43)	97 (94-99)
	25		92 (85-97)	49 (44-55)	29 (24-35)	96 (93-99)
Middle education	20	0.934 (0.886-0.982)	74 (60-86)	99 (97-99)	94 (83-99)	95 (92-98)
	21		77 (63-87)	96 (93-98)	78 (65-89)	96 (93-98)
	22		84 (71-92)	93 (89-96)	68 (55-79)	97 (94-99)
	23		86 (74-94)	87 (83-91)	55 (43-66)	97 (94-98)
	24		86 (74-94)	84 (78-98)	49 (38-60)	97 (94-98)
	25		91 (79-97)	77 (71-82)	42 (32-52)	98 (95-99)
Higher education	20	0.907 (0.836-0.977)	48 (30-66)	97 (94-99)	72 (50-88)	92 (88-96)
	21		63 (45-79)	96 (92-98)	71 (52-86)	94 (90-97)
	22		67 (48-82)	94 (89-97)	62 (44-78)	95 (91-97)
	23		74 (56-87)	92 (87-95)	58 (42-74)	96 (92-98)
	24		81 (65-93)	87 (82-92)	50 (36-64)	97 (93-98)
	25		81 (65-93)	77 (70-83)	35 (24-47)	96 (92-98)