The reliability and validity of the Turkish version of the Shortened Xerostomia Inventory in hemodialysis patients

Abstract

Introduction:The aim of this study was to translate, linguistically validate, and evaluate the psychometric properties of the Shortened Xerostomia Inventory (SXI) among Turkish patients undergoing hemodialysis (HD). Methods:The study was conducted with 81 chronic HD patients in the HD units of two state hospitals between June and August 2020. Explanatory factor analysis was implemented to test the construct validity. In addition, the testretest method was performed to test the reliability and consistency of the scale over time.Results: A total of 81 patients participated in the study. The Cronbach's alpha coefficient of SXI was 0.788. The mean values for the test were 12.84 ± 6.78 and re-test scores was 11.03 ± 6.88. Intraclass correlation coefficient value calculated as 0.992 and accordingly a statistically significant relationship between the test and retest scores (p < 0.001).Conclusions: Our study showed that the SXI is a valid and reliable measurement tool for Turkish HD patients.

Validation of the Korean version of the Summated Xerostomia Inventory among older adults residing in nursing homes

“…As the factor loading value of each item exceeded 0.70, it was confirmed that the items had good internal consistency to properly measure xerostomia [28]. The results of EFA in this study were consistent with translated versions of SXI, such as Chinese [12] and Turkish [26] versions. On the other hand, in the CFA, some goodness-of-fit indices of the single factor model were found to be unsuitable, which differed from the previous study [12].…”

“…Despite the limitation of a longer interval before the retest, the ICC value was 0.90, which was confirmed to be an excellent degree of agreement [25]. The ICCs of SXI translation studies in other countries have ranged from 0.90 to 0.99 [17,26]. The mean age of the participants in this study was 89 years old.…”

“…The mean age of the participants in this study was 89 years old. That is not only higher than the participants in the previous study (aged 64 to 69 years) [17,26], but despite the longer than optimal test-retest interval [15], similar ICC results were obtained compared to the previous study [17,26]. This study conducted test-retests in only a small number of participants at one of 16 LTCFs, so these older adults might not fully reflect the cognitive or health characteristics of all participants.…”

“…EFA was performed to evaluate the construct validity. K-SXI was confirmed to have a single-factor structure consistent with the original version [10] and translated versions from other countries, including China [12] and Turkey [26], and the total variance was considered satisfactory, at > 60% [21]. As the factor loading value of each item exceeded 0.70, it was confirmed that the items had good internal consistency to properly measure xerostomia [28].…”