The Reliability and Validity of Lymphedema Quality of Life Questionnaire-Leg in Turkish Patients with Lower Limb Lymphedema

Background: Accurate information on quality of life (QoL) outcomes among patients with lower limb lymphedema (LLL) is substantially needed to capture lymphedema-specific impairments and make clinical decisions for the management of this suffering condition. No specific instrument for QoL in patients with LLL has been translated to Turkish and validated. This study aims to adapt the Lymphedema Quality of Life Questionnaire-leg (LYMQOL-Leg) to Turkish and to test its reliability and validity in patients with LLL. Methods and Results: The Turkish-LYMQOL-Leg was obtained using forward-backward translation and administered to 138 patients with LLL, along with Short Form 36 (SF-36), and Lower Extremity Functional Scale (LEFS), between May 2015 and October 2017. A test-retest interval of 7 days was used to assess the reliability. Descriptive analysis was applied for demographic variables and validation studies were conducted by means of construct validity using Spearman's rank correlation coefficient. Internal consistency and test-retest reliability were assessed using Cronbach's alpha and intraclass correlation coefficient (ICC), respectively. All patients with LLL completed the questionnaires. The mean age and lymphedema duration were 52.01 +/- 14.73 years and 95.6 +/- 108.6 months, respectively. Internal consistency and test-retest reliability of the Turkish-LYMQOL-Leg were good with Cronbach's alpha (0.85-0.90) and test-retest ICC (0.68-0.85). External construct validity was highly confirmed by expected correlations with comparator scales SF-36 and LEFS (p < 0.01). Conclusion: The Turkish version of the LYMQOL-Leg is a valid and reliable tool for evaluating QoL in patients with LLL that can readily be applied as an outcome measure both in clinical practice and research studies.