Summary statistics for diabetes diagnosed by HbA1c compared with diabetes diagnosed by 2-hour OGTT (n=1027)
| 95% CI | ||||
| Prevalence | Pr (A) | 40.6% | 37.6 | 43.7 |
| Sensitivity | Pr (+|A) | 84.7% | 80.8 | 88.0 |
| Specificity | Pr (−|N) | 87.2% | 84.3 | 89.8 |
| Area under the ROC | (Sens.+Spec.)/2 | 0.86 | 0.84 | 0.88 |
| Likelihood ratio (+) | Pr (+|A)/Pr (+|N) | 6.62 | 5.36 | 8.18 |
| Likelihood ratio (−) | Pr (−|A)/Pr (−|N) | 0.18 | 0.14 | 0.22 |
| OR | LR (+)/LR (−) | 37.62 | 26.34 | 53.73 |
| Positive predictive value | Pr (A|+) | 81.9% | 77.9 | 85.4 |
| Negative predictive value | Pr (N|−) | 89.3% | 86.5 | 91.6 |
HbA1c, glycated haemoglobin; OGTT, oral glucose tolerance test; ROC, receiver operating characteristic.