Heleen Eising

71 Total Self-BAT scores associated with choice of heavy menstrual bleeding treatment RESULTS Respondent characteristics 231 Patients fully completed the questionnaire and were included for analysis (Figure 1). Figure 1: Flow chart for identifying eligible patients with HMB referred to the gynecological clinic of Gelre Hospitals and invited to fill out the self-BAT questionnaire. Abbreviations: Dutch diagnosis-and-treatment code (DOT; Heavy menstrual bleeding (HMB); self-administered bleeding assessment tool (self-BAT). Table 1 shows the respondent demographics (n=231) (mean [± SD] age, 42 [± 9] yrs). The majority of the respondents had blood group 0 (29%) and the median body mass index (BMI) was 26 (IQR: 24-29). None of the responders used anticoagulants. A family history of bleeding disorders was reported by 2 participants, 1 for VWD (38 yrs, total self-BAT score being 10) and 1 for thalassemia disease carrier (37 yrs, total self-BAT score being 5) (Table 1). Three out of the 101 written reflections (3%) mentioned that during diagnostic work-up for HMB they were Cases excluded: 787 (233 incorrect DOT, 4 Passed away, 550 born before <1971 or no HMB) Patients with HMB born after ‘71 referred to Gelre Hospitals, The Netherlands (January 1, 2020 till January 1, 2022) Cases identified from DOT register (n=1450) Identification of patients via DOT register Identification Patients received an invitation letter and self-BAT (n=650) Screening Non responders (n=405) Returned self-BAT (n=245) Incomplete self-BAT excluded (n=14) self-BAT included for analysis (n=231) Included 5

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