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Objective: To examine the common and specific characteristics of fibromyalgia and lipe dema, two chronic soft-tissue pain syndromes without curative therapy options. Methods: Diseases’ characteristics were compared using the findings of extensive literature and the empiric data from two cohorts, both fulfilling standardized diagnostic criteria. Outcome was measured by various socio-demographics, the generic Short Form 36 (SF36), the Fibromyalgia Severity Questionnaire (FSQ), and the 6-minute walk distance (6MWD). Empiric SF-36 data were compared to specific population-based norms and between the diagnostic groups, using standardized mean differences (SMD). Results: Female participants with fibromyalgia (n = 77) and lipedema (n = 112) showed comparable education levels and living situations. Lipedema cases were, on average, 3.9 years younger and BMI 6.3kg/m2 more obese. Women with fibromyalgia smoked more, did less sport, had more comorbidities, and worked less. Compared to the norms, health in fibromyalgia was worse than expected by SMD = –1.60 to –2.35 and in lipedema by –0.44 to –0.82 on the SF-36. The score differences between the two conditions ranged from SMD = –0.96 to –1.34 (all p < 0.001) on the SF-36 and the FSQ. For the inpatients (n = 77 fibromyalgia, n = 38 lipedema), the 6MWD was comparable (SMD = –0.09, p = 0.640). These findings were consistent with detailed data from the literature reviewed. Discussion: Fibromyalgia and lipedema share characteristics of clinical phenomenology and comorbid conditions. Disease perception is more pronounced in fibromyalgia than in lipedema, especially in social and role dysfunction, whereas the walking distance was similar for both syndromes. This difference may be explicable by limited coping skills in fibromyalgia.
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BACKGROUND: Literature on the validity of outcome measurement in lymphedema and lipedema is very sparse. This study aimed to examine the convergent, divergent and discriminant validity of a set of 5 instruments in both conditions. METHODS: Cross-sectional outcome was measured by the generic Short Form 36 (SF-36), the lymphedema-specific Freiburg Quality of Life Assessment for lymphatic disorders, Short Version (FLQA-lk), the knee-specific Knee Outcome Survey Activities of Daily Living Scale (KOS-ADL), the Symptom Checklist-90-revised (SCL-90R), and the Six-Minute Walk Test (6 MWT). Construct convergent/divergent validity was quantified by bivariate correlations and multivariate factor analysis, and discriminant validity by standardized mean differences (SMDs). RESULTS: Health was consistently better in lymphedema (n = 107) than in lipedema (n = 96). The highest construct convergence was found for physical health between the SF-36 and KOS-ADL (bivariate correlations up to 0.78, factor loads up to 0.85, explained variance up to 56.8%). The second most important factor was mental health (bivariate correlations up to 0.79, factor loads up to 0.86, explained variance up to 13.3%). Discriminant validity was greatest for the FLQA-lk Physical complaints (adjusted SMD = 0.93) followed by the SF-36 Bodily pain (adjusted SMD = 0.83), KOS-ADL Function (adjusted SMD = 0.47) and SF-36 Vitality (adjusted SMD = 0.39). CONCLUSIONS: All five instruments have specific strengths and can be implemented according to the scope and aim of the outcome examination. A minimum measurement set should comprise: the SF-36 Bodily pain, SF-36 Vitality, FLQA-lk Physical complaints, FLQA-lk Social life, FLQA-lk Emotional well-being, FLQA-lk Health state, KOS-ADL Symptoms, KOS-ADL Function, and the SCL-90R Interpersonal sensitivity.
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