Cross-cultural adaptation and psychometric properties of the Chinese version of the Orthorexia Beliefs Scale

Background: Orthorexia nervosa refers to a pathological obsession with eating "pure" or "healthy" food, and researchers have emphasized the need for psychometrically sound instruments to assess underlying belief systems rather than behavioral outcomes. The Orthorexia Beliefs Scale (OBS) was developed for this purpose, but no validated Chinese version exists. Objective: This study aimed to translate and culturally adapt the OBS into Chinese and to evaluate its psychometric properties, including reliability and construct validity, in a Chinese nonclinical sample. Methods: = 200 for confirmatory factor analysis). Item analysis, internal consistency (Cronbach's α, McDonald's ω), content validity (CVI), exploratory factor analysis (EFA), and confirmatory factor analysis (CFA) were conducted. Results: Item-total correlations ranged from 0.46 to 0.64. Content validity indices (I-CVI) were high across items, and the scale-level S-CVI/Ave was 0.99. The EFA extracted three factors explaining 50.3% of variance, consistent with the original theoretical structure. CFA results showed acceptable model fit: χ²(167) = 265.66, p