Confirmatory Factor Analyses of the Portuguese Version of the Maudsley Obsessional-compulsive Inventory

IntroductionThe Maudsley obsessional-compulsive inventory (MOCI) is a widely used self-report measure of obsessive-compulsive symptoms in clinical and non-clinical populations, both in research and clinical settings. Nogueira et al. confirmed in 2011 that the MOCI Portuguese version has good psychometric properties, having a factorial structure that is in accordance with those reported by other groups.AimsBased on the previous results of exploratory factor analysis with a Portuguese students sample, the present study aimed to perform a confirmatory factor analyses (using Mplus software) to verify if the three dimensions’ structure fitted the data.MethodsThe sample comprised 234 students on their first three years of college education (78.2% female), between 18–26 years old (M = 20.55; SD = 1.66). Participants filled the Portuguese version of the MOCI.ResultsOur results showed that the MOCI Portuguese version with original 3-factor structure has a good fit (χ2(227) = 386.987, P < .05; RMSEA = 0.053, 90%CI = 0.044–0.062; CFI = 0.928; TLI = 0.920; WRMR = 1.089). Good reliability was found for all subscales (Cronbach alpha < .80).ConclusionsThe MOCI Portuguese version reliably and validly assesses three OC symptom dimensions in young adults. Further research is needed to confirm this structure in Portuguese clinical samples.Disclosure of interestThe authors have not supplied their declaration of competing interest.