Table 3: Sensitivity, specificity, and predictive values of Hay’s classification system using Nugent’s score as the gold standard for the diagnosis of BV in study subjects.

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Sensitivity (%)10097.2
Specificity (%)88.193.4
Predictive value of positive result (%)80.493.7
Predictive value of negative result (%)10097.1
Kappa0.8300.906

(1) Hay’s: grade I = negative; grade II = negative; grade III = positive, Nugent’s: score 0–3 = negative; score 4–6 = negative; score 7–10 = positive.
(2) Hay’s: grade I = negative; grade II = positive; grade III = positive, Nugent’s: score 0–3 = negative; score 4–6 = positive; score 7–10 = positive.