Table 3. Statistics measures of the performance of the two ADA screening strategies.

Diagnostic test statistic	ADA diabetes risk test Cut-off ≥5	ADA screening criteria	Difference between two tests	Ratio of two tests	p-value
Sensitivity	0.80 (0.72–0.88)	0.81 (0.73–0.89)	-0.01 (-0.11–0.09)		0.8348
Specificity	0.57 (0.54–0.59)	0.41 (0.38–0.43)	0.16 (0.13–0.19)		<0.00001
PPV	0.12 (0.09–0.14)	0.09 (0.07–0.11)		1.31 (1.16–1.48)	<0.00001
NPV	0.98 (0.96–0.99)	0.97 (0.95–0.98)		1.01 (0.99–1.02)	0.3050
PDLR	1.85 (1.64–2.08)	1.37 (1.23–1.52)		1.35 (1.18–1.55)	<0.00001
NDLR	0.35 (0.24–0.53)	0.47 (0.31–0.71)		0.76 (0.45–1.27)	0.2895
NNT	11 (8.3–15.2)	18 (12.3–30.16)

PPV, Positive Predictive Value; NPV, Negative Predictive Value; PDLR, Positive Diagnostic Likelihood Ratio; NDLR, Negative Diagnostic Likelihood Ratio; NNT, number needed to test for blood glucose levels to diagnose one case of diabetes