Measuring referentiality in psychiatric disorders: Psychometric properties of the Spanish version of the Ideas of Reference and Interview Scale (IRIS-S)

• Isabel Argila-Plaza ^[3] ; Ana Aquino-Servín ^[3] ; María Ángeles García-León ^[1] ; Paola Fuentes-Claramonte ^[3] ; Núria Ramiro ^[4] ; Pilar Salgado-Pineda ^[3] ; Joan Soler-Vidal ^[5] ; María Llanos Torres ^[6] ; Amalia Guerrero-Pedraza ^[4] ; Manel Sánchez ^[2] ; Salvador Sarró ^[5] ; Raymond Salvador ^[5] ; Peter J McKenna ^[5] ; Ana Barajas ^[2] ; Edith Pomarol-Clotet ^[5]
  1. [1] Universidad de Sevilla

     Universidad de Sevilla

     Sevilla, España

     
  2. [2] Universitat Autònoma de Barcelona

     Universitat Autònoma de Barcelona

     Barcelona, España

     
  3. [3] FIDMAG Germanes Hospitalàries Research Foundation, Barcelona, Spain
  4. [4] FIDMAG Germanes Hospitalàries Research Foundation, Barcelona, Spain Fundació Hospitalàries Sant Boi, Sant Boi de Llobregat, Barcelona, Spain
  5. [5] FIDMAG Germanes Hospitalàries Research Foundation, Barcelona, Spain CIBERSAM ISCIII, Barcelona, Spain
  6. [6] Fundació Hospitalàries Barcelona Nord, Barcelona, Spain

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• Localización: European journal of psychiatry, ISSN 0213-6163, Vol. 39, Nº 4, 2025
• Idioma: inglés
• DOI: 10.1016/j.ejpsy.2025.100329
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  • Abstract Background and objectives Referentiality is a common symptom in psychotic and also some non-psychotic disorders, but there are few existing measures for assessing it. A recently developed detailed measure for this purpose is the Ideas of Reference Interview Scale (IRIS), which however has only been validated in a Chinese population of first episode psychosis patients.

    Methods We examined the reliability and validity of a Spanish version of the IRIS (IRIS-S) in 185 patients aged between 18 and 65 with schizophrenia or schizoaffective disorder.

    Results The IRIS-S showed internal consistency, with this being good or acceptable for the presence scale and its three subsidiary measures. Inter-rater reliability was good and test-retest reliability was also good, except for one subsidiary measure. Convergent reliability was demonstrated but was lower than expected.

    Conclusion The IRIS-S has acceptable psychometric properties when employed in patients with schizophrenia/schizoaffective disorder. Caution is necessary for its use outside psychotic disorders as it has not been examined in such populations.