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Introduction: Urinary incontinence (UI) is defined as ‘any complaint of involuntary loss of urine’. Several studies describe UI as a frequent problem among young nulliparous women who regularly and intensively practice high-impact sports, having a significant impact on their quality of life and athletic performance. An accurate estimation of the prevalence of UI in nulliparous female athletes and how this problem affects their daily and sporting life could lead to the development of prevention and treatment strategies. However, there is no data collection tool focused on analysing the relationship between UI and sport, with the Delphi method being a particularly useful tool to design and validate new instruments. Objectives: To develop and validate a questionnaire to analyse the relationship between sports practice and the early onset of UI in women. Material and methods: A questionnaire was designed, using the Delphi method, by a group of experts, made up of 9 professionals. With the definitive version, a pilot study was conducted with 16 female basketball players. Results: A total of 3 rounds were carried out and a final questionnaire with 43 questions was obtained, with a Cronbach's alpha value of 0.967 in the reliability analysis. Conclusions: The results supported the reliability and validity of the questionnaire, designed using the Delphi method, to analyse the relationship between sports practice and early onset of UI in women.
