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Table 5 Cross tabulation of vaginal pH level and Nugent class of pregnant women, pH score > = 4.5

From: Basic vaginal pH, bacterial vaginosis and aerobic vaginitis: prevalence in early pregnancy and risk of spontaneous preterm delivery, a prospective study in a low socioeconomic and multiethnic South American population

pH score

Nugent class (N,% within class)

 
 

Normal

Intermediate

BV

Total N (% of grand total)

4.5

438 (83.6)

92 (46.5)

87 (18.2)

617 (51.5)

5.0

71 (13.5)

81 (40.9)

271 (56.8)

423 (35.3)

5.5

15 (2.9)

25 (12.6)

111 (23.3)

151 (12.6)

6.0

0 (0)

0 (0)

8 (1.7)

8 (0.7)

Total

524 (100)

198 (100)

477 (100)

1199 (100)

  1. Pearson Chi-Square, df = 6, 2-sided, p < 0.0001.
  2. Likelihood Ratio test, df = 6, 2-sided, p < 0.0001.