Objectives: The aims of this study were to describe the development of a Chinese version of the Orthognathic Quality of Life Questionnaire (OQLQ) and examine its reliability and validity.
Methods: The original English version of the OQLQ was translated into Chinese (OQLQ-C) by a forward-backward translation method. Psychometric evaluation of the OQLQ-C was carried out on a sample of 126 patients with dentofacial deformities. Reliability of the OQLQ-C was determined by means of internal consistency and test-retest methods, while validity was ascertained by content validity and construct validity.
Results: Internal consistency for total OQLQ-C score was 0.932 (Cronbach's alpha), and the test-retest reliability was 0.913 (Spearman correlation coefficient). Content validity of OQLQ-C was supported by content validity index (CVI) with scale-level (S-CVI) of 0.99 and item-level (I-CVI) of 0.875 to 1. The OQLQ-C was distributed to 4 different factors, and the total variance explained was 67.049%.
Conclusions: The Chinese version of the OQLQ demonstrated acceptable reliability and good validity in patients with dentofacial deformities.
Clinical relevance: These findings enable assessments of oral health-related quality of life in Chinese literate patients with dentofacial disorders.
Trial registration: ChiCTR1900028206.
Keywords: Oral health-related quality of life (OHRQoL); Orthognathic Quality of Life Questionnaire (OQLQ); Quality of life (QoL); Reliability; Validity.