Eating and Weight Disorders · 5 authors, 3 centres
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The final BOS-35 demonstrated a five-factor structure with good internal consistency (α = .80–.90) and adequate temporal stability (r = .62–.88), supporting it as a valid and reliable instrument for assessing orthorexia nervosa psychological variables.
The initial 64-item BOS was refined through item analysis, removing 26 items due to low homogeneity, asymmetry, or kurtosis, yielding a 38-item version. Exploratory factor analysis identified a five-factor structure (Behavioral, Concern for Healthy Food, Attitudes and Beliefs About Food, Vital Achievement, and Emotional Discomfort). After removing three items with low factor loadings, the final BOS-35 was obtained. The BOS-35 and its factors showed good internal consistency (Cronbach's α = .80–.90) and adequate temporal stability over one month (r = .62–.88), except for Vital Achievement. The highest association was between Emotional Distress (BOS) and the Diet subscale (EAT-26; r = .51). Limitations include unbalanced sex distribution, small test–retest sample (n = 39), and absence of a Spanish ON-specific questionnaire for convergent validity. The BOS-35 is presented as a valid, reliable, and brief tool for assessing ON psychological variables in general populations.
