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Published on: December 4, 2020
Epidemiologic determinants of vaginal pH
M García-Closas1, R Herrero, C Bratti
1Division of Cancer Epidemiology and Genetics, National Cancer Institute, Department of Pathology, The Hopkins Medical Institutions, International Agency for Research on Cancer, Ministerio de Salud Costa Rica.
Objectives:
This study was undertaken to evaluate the relationship between vaginal pH and factors related to cervical cancer.
Study Design:
In a population-based sample of 9161 women from Guanacaste Province in Costa Rica women were categorized into 2 groups, those with vaginal pH in the reference range (4.0-4.5) and those with elevated vaginal pH (5.0-5.5). Odds ratios were used to estimate the relationship between elevated pH and its potential determinants.
Results:
Aging was strongly associated with increasing vaginal pH, starting at around 45 years of age and continuing into old age. Menopause was responsible for an additional 1.7-fold increase in the odds of having an elevated pH (odds ratio 1.7, 95% confidence interval 1.4-2.0). Human papillomavirus infection and cervical intraepithelial neoplasia were not associated with changes in pH.
Conclusions:
Our data indicate that vaginal pH is strongly related to age and to menopausal status and thus could be a marker of age-related hormonal changes. Elevated pH does not appear to be associated with risk of high-grade intraepithelial neoplasia among women infected with human papillomavirus.
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