Sensitivity, specificity, and predictive values for grading of Gram stained smears for the diagnosis of bacterial vaginosis using Amsel’s criteria as the gold standard
| 1 | 2 | 3 | |
|---|---|---|---|
| 1 = Smears: grade I = negative; grade III = positive; grade II = excluded. | |||
| 2 = Smears: grades I, II = negative; grade III = positive. | |||
| 3 = Smears: grade I = negative; grades II, III = positive. | |||
| NB: 6 smears graded as 0 (all had <3 Amsel’s criteria); 8 smears graded as IV (all had <3 Amsel’s criteria). | |||
| Sensitivity | 97.5 | 96.0 | 97.5 |
| Specificity | 90.5 | 90.5 | 73.8 |
| Predictive value for positive | 94.1 | 94.1 | 82.6 |
| Predictive value for a negative | 96.0 | 96.0 | 96.0 |