TABLE 5.

Sensitivity and Specificity for Various Cutoffs on the Ordinal Rating Scale (0 –10)

	Alzheimer’s Disease versus Comparison			MCI versus Comparison			Alzheimer’s Disease versus MCI			MCI + Alzheimer’s Disease versus Comparison
Cutoff*	Sensitivity	Specificity	PLR	Sensitivity	Specificity	PLR	Sensitivity	Specificity	PLR	Sensitivity	Specificity	PLR
≥1	0.98	0.46	1.8	0.82	0.46	1.5	0.98	0.18	1.2	0.90	0.46	1.7
≥2	0.84	0.76	3.5	0.58	0.76	2.4	0.84	0.42	1.4	0.71	0.76	3.0
≥3	0.66	0.90	6.6	0.40	0.90	4.0	0.66	0.60	1.7	0.53	0.90	5.3
≥4	0.54	0.94	9.0	0.26	0.94	4.3	0.54	0.74	2.1	0.40	0.94	6.7

MCI=mild cognitive impairment; PLR=positive likelihood ratio; n=50 each for comparison, MCI, and Alzheimer’s disease groups.

^*A higher score represents greater impairment.