Khalili-Parapary Younes, Heidarzadeh Mehdi, Mozaffari Naser, Naseri Parisa
Department of Medical Surgical, School of Nursing and Midwifery, Ardabil University of Medical Sciences, Ardabil, Iran.
Department of Biostatistics, School of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Indian J Palliat Care. 2017 Oct-Dec;23(4):419-424. doi: 10.4103/IJPC.IJPC_63_17.
Edmonton Symptom Assessment Scale (ESAS) was developed to assess objective and subjective symptoms in patients with cancer in all stages of their disease.
The aim of the study was to translate and determine the psychometric properties of ESAS in an Iranian population.
The current study was carried out to determine reliability and validity of ESAS using 246 patients with cancer in Imam Khomeini Hospital, Ardabil, Iran. After translating the instrument to Persian, content and face validity, discriminant validity, internal consistency, and test-retest were done to determine psychometric properties of ESAS. Furthermore, the construct validity was determined using confirmatory factor analysis to evaluate factor structure of the tool in two models: single factor and three factor.
With regard to goodness of fit indices including comparative fit index, incremental fit index, and normed fit index, factor structure of ESAS was confirmed with one factor and nine items. Because the values of average variance extracted of each dimension were less than the square of correlation coefficients between the three dimensions of ESAS, three-factor model was not confirmed. Discriminant validity was confirmed by finding significant differences between the two groups, patients with good general and critically ill conditions. Cronbach's alpha for the overall ESAS was 0.88, and correlation between test-retest with 4-6 h interval was 0.86 ( = 0.86 < 0001).
This study showed that Persian version of ESAS with same factor structure mentioned in the original version is an applicable tool for assessing objective and subjective symptoms in Iranian patients with cancer.
埃德蒙顿症状评估量表（ESAS）旨在评估癌症患者在疾病各个阶段的客观和主观症状。
本研究的目的是对ESAS进行翻译，并确定其在伊朗人群中的心理测量学特性。
本研究通过对伊朗阿尔达比勒伊玛目霍梅尼医院的246名癌症患者进行ESAS的可靠性和有效性测定。将该工具翻译成波斯语后，进行了内容效度、表面效度、区分效度、内部一致性和重测，以确定ESAS的心理测量学特性。此外，使用验证性因子分析来确定结构效度，以评估该工具在单因素和三因素两种模型中的因子结构。
关于拟合优度指标，包括比较拟合指数、增量拟合指数和规范拟合指数，ESAS的因子结构通过单因素和九个项目得到确认。由于ESAS三个维度各自提取的平均方差值小于三个维度之间相关系数的平方，三因素模型未得到确认。通过发现一般状况良好的患者和重症患者两组之间的显著差异，确认了区分效度。ESAS总体的Cronbach's alpha为0.88，间隔4 - 6小时的重测相关性为0.86（ = 0.86 < 0.0001）。
本研究表明，波斯语版ESAS与原版具有相同的因子结构，是评估伊朗癌症患者客观和主观症状的适用工具。
