Validation of the Brazilian version of WHODAS 2.0 for individuals with temporomandibular disorders

Abstract

ABSTRACT This study aims to validate the Brazilian version of World Health Organization Disability Assessment Schedule (WHODAS 2.0) for individuals with temporomandibular disorders (TMD), assessing its psychometric properties, including internal consistency, construct validity, and discriminant validity. In total, 100 female and male patients with TMD were included. Participants were assessed based on the Research Diagnostic Criteria for TMD (RDC/TMD). For statistical analyses, McDonald’s omega coefficient was used to assess internal consistency; Spearman correlation, for construct validity; Kruskal-Wallis test and multiple comparisons (Dunn method), for discriminant validity. The results of internal consistency for the WHODAS 2.0 domains ranged from 0.70 to 0.94. The WHODAS 2.0 showed a moderate and significant correlation with the disability points of the RDC/TMD and with the WHOQOL-BREF domains. In the discriminant validity, significant differences were found in all domains of WHODAS 2.0 between grade 0 and grade III, between grade I and grade III, and between grade II and grade III from the chronic pain grading of the RDC/TMD. The results demonstrate that the instrument is reliable and valid for measuring the functioning of individuals with TMD, presenting acceptable psychometric properties for internal consistency, as well as for construct validity and discriminant validity.