Background: Feminine hygiene products contain chemicals that may be harmful to human health. Observational studies of the long-term health effects of such products largely rely on self-reported, recalled exposure. We sought to capture patterns of use over the life-course and evaluate the reliability of self-reported data. Methods: We collected retrospective data on douching and genital talc use in the US-based Sister Study at two time points and evaluated the consistency of reporting. At enrollment (2003-09), participants were asked to report use in the last year and during ages 10-13. On a follow-up questionnaire (2017-19), participants were asked about their use of douche or genital talc over their lifetimes. Results: Among 36,202 women who completed both questionnaires, 14% initially reported ever douching and 27% initially reported ever using genital talc. On the follow-up questionnaire, 51% of participants reported ever douching and 32% reported ever using genital talc. Comparisons across the two questionnaires for use in the year prior to enrollment showed good consistency, with 90% providing the same responses about douching and 87% providing the same responses about genital talc use. Reliability did not vary by cancer status, race and ethnicity, attained education, or age, though there was some evidence of recall bias for genital talc use among ovarian cancer survivors. Conclusions: Classification of ever use of feminine hygiene products may be recalled with good consistency, but agreement was lower for specific time periods and trends may vary by subgroup. These potential differences warrant careful consideration in future studies. Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.
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Medicine by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00302841026182,00306932607174,alsfakia@gmail.com,