Table 2. Sensitivity and specificity analysis in validation study of self-reported type 2 diabetes in Shanghai (n = 4,322).

	FPG values ≥7.0 mmol/L or use of diabetes medication (n = 4,322)
	Yes	No	Total
Self-reported diabetes
Yes	578	30	608
No	225	3,489	3,714
Total	803	3,519	4,322
Validation measurements
Sensitivity, % (95% CI)	72.0 (68.7–75.1)
Specificity, % (95% CI)	99.2 (98.8–99.4)
PPV, % (95% CI)	95.1 (93.0–96.7)
NPV, % (95% CI)	93.9 (93.1–94.7)
Kappa (95% CI)	0.78 (0.76–0.81)

CI, confidence interval; FPG, fasting plasma glucose; NPV, negative predictive value; PPV, positive predictive value.

Data for sensitivity, specificity, PPV and NPV are shown as percentages (95% confidence intervals).

Data for Kappa is shown as Kappa value (95% confidence interval).