Trends in Psychiatry and Psychotherapy
https://trends.org.br/article/doi/10.1590/S2237-60892012000200009
Trends in Psychiatry and Psychotherapy
Original Article

Application of the Rasch model in measuring personality disorders

Aplicação do modelo de Rasch na medida de transtornos da personalidade

Lucas de Francisco Carvalho; Ricardo Primi; Gregory J. Meyer

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Abstract

OBJECTIVE: To describe item and person parameters obtained with the Rasch model, one of the item response theory models, in the assessment of personality disorders based on Millon's theory. METHOD: A total of 350 people participated in the study. Age ranged from 18 to 67 years (mean ± standard deviation = 27.02±10.13), and 71.7% of the participants (n = 251) were female. Of the 350 individuals, 21.1% (n = 74) answered affirmatively about being under psychiatric treatment and taking psychiatric medications. The Personality Disorders Dimensional Inventory (PDDI), an instrument designed to assess personality disorders according to Millon's theory, was applied to all participants. Data were analyzed using the Rasch model. RESULTS: Overall, analysis with the Rasch model revealed that the PDDI has adequate psychometric properties for the assessment of personality disorders. CONCLUSION: Among the contributions of item response theory models for clinical instruments, the Rasch person-item map deserves to be highlighted as a successful attempt to improve the understanding of clinical scores obtained in response to particular test items.

Keywords

Health evaluation, diagnosis, validation studies, psychiatric status rating scales

Resumo

OBJETIVO: Descrever os parâmetros de itens e pessoas obtidos com o modelo de Rasch, um dos modelos da teoria de resposta ao item, na avaliação de transtornos da personalidade de acordo com a teoria de Millon. MÉTODO: Participaram do estudo 350 pessoas. A idade variou de 18 a 67 anos (média ± desvio padrão = 27.02±10.13), e 71.7% (n = 251) eram do sexo feminino. Dos 350 participantes, 21.1% (n = 74) responderam afirmativamente sobre estarem em tratamento psiquiátrico e utilizarem medicamento psiquiátrico. O Inventário Dimensional de Transtornos da Personalidade (IDTP), destinado à avaliação dos transtornos da personalidade com base na teoria de Millon, foi aplicado a todos os participantes. Os dados foram analisados por meio do modelo de Rasch. RESULTADOS: De modo geral, os resultados da análise por meio do modelo de Rasch revelaram que o IDTP tem parâmetros psicométricos adequados para a avaliação de transtornos da personalidade. CONCLUSÃO: Entre as contribuições da teoria de resposta ao item para instrumentos clínicos, o mapa de pessoas-itens do modelo Rasch merece destaque enquanto tentativa bem-sucedida de aumentar a compreensão das pontuações clínicas obtidas em resposta a determinadas questões de um teste.

Palavras-chave

Avaliação em saúde, diagnóstico, estudos de validação, escalas de graduação psiquiátrica

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