This dataset contains anonymized data collected at cardiology outpatient clinics and general practitioners across six statistical regions of Slovenia between April and December 2024, as part of the psychometric validation of the Slovene version of the Kansas City Cardiomyopathy Questionnaire (KCCQ-SVN) in patients with heart failure. It includes 230 completed KCCQ-SVN questionnaires alongside sociodemographic and clinical data (age, sex, NYHA class, ejection fraction, comorbidities, medication use) and responses to the EQ-5D-5L questionnaire. A subset of 35 patients completed the questionnaire twice for test–retest reliability assessment. Access to the dataset is available upon reasonable request to the corresponding author.
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