Validity and reliability of the Turkish version of the lymphedema symptom intensity and distress survey

Abstract

Objectives: This study aims to adapt the Lymphedema Symptom Intensity and Distress Survey- Arm (LSIDS-Arm) into Turkish and to test its validity and reliability. Patients and methods: Between September 2017 and July 2018, this descriptive, methodological study included a total of 186 women (mean age: 55.4±10.2 years; range, 20 to 80 years) who were diagnosed with breast cancer-related lymphedema (BCRL) and followed in the lymphedema outpatient clinic. Data were collected using sociodemographic and clinical features form, LSIDS-Arm, and Functional Assessment of Cancer Treatment-Breast Cancer Scale+4 (FACT-B+4). After the linguistic and content validity of the scale was achieved, confirmatory factor analysis and known-groups validation were utilized to test the construct validity. Reliability of the survey was tested using the Cronbach alpha and Spearman Brown coefficient, item analysis, and parallel forms reliability. Results: All patients completed the questionnaire. After achievement of linguistic and content validity, confirmatory factor analysis results were found to be higher than the accepted value. Known-groups validation revealed a significant difference in the mean scores for the intensity and distress scales between the patients with and without lymphedema. Cronbach alpha for the subscales ranged from 0.61 to 0.86. Parallel forms reliability showed a moderate, significant correlation between subscales of the intensity and distress scales of the survey and the subscales of FACT-B+4. Conclusion: The Turkish version of the survey is valid and reliable and can be used to evaluate symptoms, severity of symptoms, and distress caused by BCRL symptoms in the Turkish women.