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Sexual Intercourse and Risk of Symptomatic Urinary Tract Infection in Post-Menopausal Women

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ABSTRACT

Background

Sexual intercourse increases the risk of symptomatic urinary tract infections (UTI) in young women, but its role among post-menopausal women is unclear.

Objective

To determine whether recent sexual intercourse, as documented by daily diaries, is associated with an increased risk of symptomatic UTI in post-menopausal women.

Design

A 2-year prospective cohort study conducted from 1998 to 2002.

Participants

One thousand and seventeen randomly selected post-menopausal women enrolled at Group Health Cooperative (GHC), a Washington State HMO.

Measurements and Main Results

Women were asked to enter daily diary information on vaginal intercourse, medication use, and genito-urinary symptoms. The outcome of interest, symptomatic UTI, was defined as a positive urine culture ≥105 CFU/mL of a uropathogen and the presence of ≥2 acute urinary symptoms. Nine hundred thirteen women returned diaries and were included in this study. Seventy-eight women experienced 108 symptomatic UTIs, and 361 (40%) reported sexual intercourse in their diaries. There was an increased hazard for UTI 2 calendar days after the reporting of sexual intercourse in the diaries (adjusted hazard ratio [HR], 3.42, 95% CI 1.49–7.80), while there was no evidence for an increased hazard associated with intercourse at other times. When the UTI criterion was relaxed from ≥105 CFU/mL to ≥104 CFU/mL, adding 9 UTI events to the analysis, the HR for UTI 2 days after intercourse changed slightly to 3.26 (95% CI 1.43–7.43).

Conclusions

Our data suggest that, as with younger women, recent sexual intercourse is strongly associated with incident UTI in generally healthy post-menopausal women.

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ACKNOWLEDGMENTS

This work was funded by the National Institute of Health (T32AI07140, RO1 DK43134, K23DK02660 (KG)). Additional support was provided by the Center for Health Studies (CHS) at the Group Health Cooperative (GHC) and the Health Services Research & Development Center of Excellence and the VA Puget Sound Health Care System (HSR&D) in Seattle, Washington. The views expressed in this article are those of the authors and do not necessarily reflect the position or policy of the Department of Veterans Affairs. The authors acknowledge Linn Abraham for her data management and statistical programming assistance. We also thank Dr. Walter Stamm for his thoughtful comments on this manuscript. A segment of this project was presented at the Infectious Disease Society of Obstetrics and Gynecology conference in Carmel, California in August, 2006.

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Correspondence to Elya E. Moore PhD.

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Moore, E.E., Hawes, S.E., Scholes, D. et al. Sexual Intercourse and Risk of Symptomatic Urinary Tract Infection in Post-Menopausal Women. J GEN INTERN MED 23, 595–599 (2008). https://doi.org/10.1007/s11606-008-0535-y

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  • DOI: https://doi.org/10.1007/s11606-008-0535-y

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