Table 1.
Coordinates of the ROC Curve: GCB HbA1c Cutoff Values for FSB HbA1c Values ≥ 6.5% (N=75)
| Criterion Value for a GCB %HbA1c Cutoff | Sensitivity | 1-Specificity |
|---|---|---|
| 3.80 | 1.000 | 1.000 |
| 4.85 | 1.000 | 0.983 |
| 4.95 | 1.000 | 0.967 |
| 5.10 | 1.000 | 0.950 |
| 5.25 | 1.000 | 0.933 |
| 5.35 | 1.000 | 0.917 |
| 5.45 | 1.000 | 0.833 |
| 5.55 | 1.000 | 0.800 |
| 5.65 | 1.000 | 0.717 |
| 5.75 | 1.000 | 0.600 |
| 5.85 | 1.000 | 0.467 |
| 5.95 | 1.000 | 0.300 |
| 6.05 | 0.933 | 0.200 |
| 6.15 | 0.933 | 0.167 |
| 6.30 | 0.933 | 0.100 |
| 6.40 | 0.800 | 0.050 |
| 6.55 | 0.600 | 0.033 |
| 6.70 | 0.600 | 0.017 |
| 6.85 | 0.467 | 0.000 |
| 6.95 | 0.400 | 0.000 |
| 7.10 | 0.333 | 0.000 |
| 7.30 | 0.133 | 0.000 |
| 7.45 | 0.067 | 0.000 |
| 8.50 | 0.000 | 0.000 |
ROC=Receiver Operating Characteristic; HbA1c=hemoglobin A1c; FSB=finger stick blood; GCB=gingival crevicular blood