Table 1.

Diagnostic Test Characteristics of SBT, BAS, O3DY, and cAD8

	Sensitivity, % (95% CI††)	Specificity, % (95% CI)	Positive Likelihood Ratio (95% CI)	Negative Likelihood Ratio (95% CI)	AUC^ (95% CI)
SBT	95 (88–98)	65 (61–67)	2.7 (2.2–3.0)	0.08 (0.03–0.2)	0.930 (0.862–0.971)
BAS	95 (88–98)	52 (48–54)	2.0 (1.7–2.2)	0.10 (0.03–0.3)	0.934 (0.867–0.974)
O3DY	95 (85–99)	51 (46–53)	2.0 (1.6–2.1)	0.10 (0.03–0.3)	N/A
cAD8	83 (71–91)	63 (55–68)	2.2 (1.6–2.8)	0.27 (0.1–0.5)	0.816 (0.727–0.886)
SBT+cAD8*	91 (81–97)	27 (20–30)	1.2 (1.0–1.4)	0.32 (0.1–0.9)	N/A
BAS+cAD8†	97 (90–99)	11 (6–12)	1.1 (0.9–1.1)	0.27 (0.04–1.6)	N/A
O3DY+cAD8‡	100	0	N/A	N/A	N/A

^*Abnormal SBT or abnormal cAD8.

^†Abnormal BAS or abnormal cAD8.

^‡Abnormal O3DY or abnormal cAD8.

^{^}n = 102 subjects who had data for all four instruments collected.

^††Confidence intervals for the estimated parameters were computed based upon constant chi-square boundaries as described in Fleiss JL. Statistical Methods for Rates and Proportions. New York, NY: Wiley, 1981.

SBT = Short Blessed Test; BAS = Brief Alzheimer’s Screen; O3DY = Ottawa 3-Day-Year; AUC = area under the receiver operating characteristic curve; cAD8 = caregiver-completed Alzheimer’s Disease-8