Validation of the Lymphedema Quality of Life Questionnaire for German Patients with Lipedema.

Background: Lipedema, a chronic condition affecting mostly women, involves painful bilateral increase of subcutaneous adipose tissue. The societal impact of this disease is still poorly understood. This study aimed to validate the Lymphedema Quality-of-Life Questionnaire (LYMQOL) for lipedema patients in Germany, assessing its feasibility, reliability, and validity. Methods and Results: A total of 81 German-speaking stage II lipedema patients were asked to complete both the LYMQOL (arm and leg versions) and the Short Form Health Survey (SF-36) questionnaires twice, and this was 2 weeks apart. Feasibility was evaluated through response rates, scale structure via factor analysis, validity through SF-36 correlations, and reliability through internal consistency and test-retest reliability analysis. A valid 68% response rate was achieved. Both arm and leg versions demonstrated construct validity with significant correlations to SF-36 subscales. Internal consistency for the leg version was acceptable to excellent, and good to excellent for the arm version. Test-retest reliability was very good for both versions. Conclusions: This study validates the LYMQOL as a robust tool for assessing lipedema patients' quality of life, and also validates the German translation contained in this article. We hope to fill a critical research gap and support future clinical studies aiming at enhancing patient care.