Giada Pietrabissa1,2, Alessandro Rossi3, Susan Simpson4,5, Andrea Tagliagambe6, Venessa Bertuzzi6, Clarissa Volpi6, Giulia Fava7, Gian Mauro Manzoni8,9, Giovanni Gravina7, Gianluca Castelnuovo8,6. 1. Istituto Auxologico Italiano, IRCCS, Psychology Research Laboratory, Milan, Italy. giada.pietrabissa@unicatt.it. 2. Department of Psychology, Catholic University of Milan, Milan, Italy. giada.pietrabissa@unicatt.it. 3. Department of Philosophy, Sociology, Education, and Applied Psychology, Section of Applied Psychology, University of Padua, Padua, Italy. 4. School of Psychology, Social Work and Social Policy, University of South Australia, GPO Box 8 2471, Adelaide, South Australia, 5001, Australia. 5. Regional Eating Disorders Unit, NHS Lothian, St. John's Hospital, Livingston, Scotland, UK. 6. Department of Psychology, Catholic University of Milan, Milan, Italy. 7. Casa di Cura San Rossore, Pisa, Italy. 8. Istituto Auxologico Italiano, IRCCS, Psychology Research Laboratory, Milan, Italy. 9. Faculty of Psychology, eCampus University, Novedrate, Como, Italy.
Abstract
PURPOSE: To examine the psychometric properties and the factorial structure of the Italian version of the schema mode inventory for eating disorders-short form (SMI-ED-SF) for adults with dysfunctional eating patterns. METHODS: 649 participants (72.1% females) completed the 64-item Italian version of the SMI-ED-SF and the eating disorder examination questionnaire (EDE-Q) for measuring eating disorder symptoms. Psychometric testing included confirmatory factor analysis (CFA) and internal consistency. Multivariate analysis of covariance (MANCOVA) was also run to test statistical differences between the EDE-Q subscales on the SMI-ED-SF modes, while controlling for possible confounding variables. RESULTS: Factorial analysis confirmed the 16-factors structure for the SMI-ED-SF [S-Bχ2 (1832) = 3324.799; p < .001; RMSEA = 0.045; 90% CI 0.043-0.048; CFI = 0.880; SRMR = 0.066; χ2/df = 1.81; < 3]. Internal consistency was acceptable in all scales, with Cronbach's Alpha coefficients ranging from 0.635 to 0.873. CONCLUSIONS: The SMI-ED-SF represents a reliable and valid alternative to the long-form SMI-ED for assessment and conceptualization of schema modes in Italian adults with disordered eating habits. Its use is recommended for clinical and research purposes. LEVEL OF EVIDENCE: Level V, descriptive study.
PURPOSE: To examine the psychometric properties and the factorial structure of the Italian version of the schema mode inventory for eating disorders-short form (SMI-ED-SF) for adults with dysfunctional eating patterns. METHODS: 649 participants (72.1% females) completed the 64-item Italian version of the SMI-ED-SF and the eating disorder examination questionnaire (EDE-Q) for measuring eating disorder symptoms. Psychometric testing included confirmatory factor analysis (CFA) and internal consistency. Multivariate analysis of covariance (MANCOVA) was also run to test statistical differences between the EDE-Q subscales on the SMI-ED-SF modes, while controlling for possible confounding variables. RESULTS: Factorial analysis confirmed the 16-factors structure for the SMI-ED-SF [S-Bχ2 (1832) = 3324.799; p < .001; RMSEA = 0.045; 90% CI 0.043-0.048; CFI = 0.880; SRMR = 0.066; χ2/df = 1.81; < 3]. Internal consistency was acceptable in all scales, with Cronbach's Alpha coefficients ranging from 0.635 to 0.873. CONCLUSIONS: The SMI-ED-SF represents a reliable and valid alternative to the long-form SMI-ED for assessment and conceptualization of schema modes in Italian adults with disordered eating habits. Its use is recommended for clinical and research purposes. LEVEL OF EVIDENCE: Level V, descriptive study.