Co-creating and testing a self-management digital solution for bladder health and urinary continence among people aged 50 and over: protocol for the international KOKU Bladder project.

introductionThe ageing population in Europe is experiencing a significant rise in urinary incontinence (UI), which affects millions and incurs substantial healthcare costs. While conservative treatment (eg, behavioural strategies, pelvic floor exercises) can help manage UI, there is a need for evidence-based eHealth solutions to improve adherence and treatment outcomes. The KOKU Bladder project aims to co-create, develop and test an eHealth intervention to improve bladder health (BH) and UI in adults aged 50 and over. METHODS AND ANALYSIS: Phase 1 will consist of the co-creation and technological development of the eHealth solution. First, a rapid review will be undertaken to identify eHealth solutions (ie, technologies and websites), including behaviour change techniques (BCTs) and elements of gamification for self-management of BH and UI in adults aged 50 and over. Also, a consultation with eight experts on BH/UI and/or BCTs will be conducted to explore recommendations for the new eHealth solution. The PROSECO framework will facilitate an assessment of the co-creation process. Phase 1 will additionally include the conduction of at least six focus groups, to be held in Kaunas (Lithuania), Catalonia (Spain) and Manchester (UK) to co-create the contents of the digital solution. Each focus group will include 10-12 community-dwelling adults aged 50+, with different physical conditions and continence status, as well as health professionals and other stakeholders. The information collected will be analysed thematically. First, we will hold three focus groups, one in each country, to find out the opinion of the participants. Once the focus groups are finished and the first version of the technological solution is created, participants will test it and provide feedback in three additional focus groups. Participants' opinions will be taken into account to make modifications to the solution and co-create the final version. Gamification methods and the Honeycomb model for user experience will be followed in order to achieve a technological solution that is adequate for its target population.Phase 2 will consist of a multicentre pilot study with a mixed method (quantitative and qualitative) approach to assess the feasibility and acceptability of the newly developed technological solution. At least 120 participants (40 per country) will be recruited and randomised into two groups: intervention (KOKU Bladder) and control (indirect health education). The primary outcome will be the severity of UI, according to the International Consultation on Incontinence Questionnaire-UI short form. Secondary outcomes will include quality of life (EuroQol 5-Dimension, 5-Level), life-impact related to UI (Incontinence Impact Questionnaire-7), lower urinary tract symptoms (Symptoms of Lower Urinary Tract Dysfunction Research Network Symptom Index-10 (LURN SI-10)), International Consultation Questionnaire on Incontinence Bowel Score, Patient Global Impression of Improvement; levels of physical activity and sedentary behaviour (accelerometer), as well as satisfaction with treatment (Client Satisfaction Questionnaire (CSQ-8)). The latter, together with recruitment, adherence, retention, attrition and data loss, will be used for measuring intervention feasibility and acceptability. Statistical and clinical significance, as well as effect size, will be calculated. ETHICS AND DISSEMINATION: The project is approved by the Research Ethics Committee of IRIS-CC approved the project on 9 January 2025 (code 24/095), the Research Ethics Committee of Hospital Universitari Arnau de Vilanova of Lleida on 27 January 2025 (CEIC-3201), the Commission on Research Ethics of Lithuania on 3 March 2025 (SMTEK-31) and the Research Ethics Committee 3 of the University of Manchester on 13 August 2025 (2025-23619-43258). Participation and withdrawal will be voluntary. Informed consent will be obtained from candidates willing to join the project. Study results will be disseminated via publication of scientific articles, presentations at professional workshops, webinars and congresses, as well as through social media and lay summaries for participants and the general public. TRIAL REGISTRATION NUMBER: NCT06583733. PROSPERO REGISTRATION NUMBER: CRD42024597624.