Development and Validation of a Simple Risk Score for Undiagnosed Type 2 Diabetes in a Resource-Constrained Setting

Table 3

Performance of different cut-points for detecting undiagnosed type 2 diabetes in the development database.

Total score	At high risk	Sensitivity	Specificity	PPV	NPV	Correctly classified	LR+	LR−
≥1	69.8%	93.5%	30.6%	2.6%	99.6%	31.8%	1.34	0.21
≥2	34.9%	69.6%	65.8%	3.9%	99.1%	65.9%	2.04	0.46
≥3	11.0%	30.4%	89.4%	5.4%	98.5%	88.3%	2.87	0.78
≥4	1.3%	2.2%	98.7%	3.2%	98.1%	96.8%	1.68	0.99

PPV: positive predictive value; NPV: negative predictive value; LR+: positive likelihood ratio; LR−: negative likelihood ratio.
Those at high risk are the proportion of participants over the total score.