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.

	1	2
Sensitivity (%)	100	97.2
Specificity (%)	88.1	93.4
Predictive value of positive result (%)	80.4	93.7
Predictive value of negative result (%)	100	97.1
Kappa	0.830	0.906

(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.