Mireia Rabella1, Eva Grasa2, Joan Trujols3, Ignasi Gich4, Rafael Torrubia5, Iluminada Corripio2, Víctor Pérez6, Jordi Riba7. 1. Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau. Barcelona, Spain Centro de Investigación Biomédica en Red de Salud Mental, CIBERSAM Departament de Farmacologia, de Terapèutica i de Toxicologia. Universitat Autònoma de Barcelona, Spain. 2. Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau. Barcelona, Spain Centro de Investigación Biomédica en Red de Salud Mental, CIBERSAM Departament de Psiquiatria i de Medicina Legal. Universitat Autònoma de Barcelona. Barcelona, Spain. 3. Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau. Barcelona, Spain Centro de Investigación Biomédica en Red de Salud Mental, CIBERSAM. 4. Centro de Investigación Biomédica en Red de Salud Mental, CIBERSAM Centre d'Investigació del Medicament, Institut de Recerca, Servei Farmacologia Clínica, Hospital de la Santa Creu i Sant Pau. Barcelona, Spain Departament de Psiquiatria i de Medicina Legal. Universitat Autònoma de Barcelona. Barcelona, Spain. 5. Departament de Psiquiatria i de Medicina Legal. Universitat Autònoma de Barcelona. Barcelona, Spain. 6. Centro de Investigación Biomédica en Red de Salud Mental, CIBERSAM Departament de Psiquiatria i de Medicina Legal. Universitat Autònoma de Barcelona. Barcelona, Spain Institut de Neuropsiquiatria i Addiccions, Hospital del Mar, IMIM (Hospital del Mar Medical Research Institute), Barcelona, Spain. 7. Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau. Barcelona, Spain Centre d'Investigació del Medicament, Institut de Recerca, Servei Farmacologia Clínica, Hospital de la Santa Creu i Sant Pau. Barcelona, Spain.
Abstract
OBJECTIVE: The need for early detection, prevention and intervention in psychosis has prompted the study of prodromal and threshold syndromes. One strategy involves the assessment of schizotypy, a personality construct involving unusual perceptual experiences, magical thinking or bizarre behavior. Sensitive measurement instruments could potentially allow detection of signs heralding transition to psychosis in high-risk individuals, or risk of relapse in patients after a first psychotic episode. The Schizotypal Personality Questionnaire (SPQ) is a self-report scale, originally developed for English speakers, that covers the nine DSM-IV criteria for schizotypal personality disorder (SPD). Our aim was to validate a Spanish version of the SPQ and assess its psychometric properties. METHODS: The original SPQ was back-translated and administered to university students (n=250). We assessed the internal consistency, the convergent, discriminant and criterion validity of the instrument, and analyzed its factor structure. RESULTS: Our version of the SPQ showed good internal consistency, and convergent (O-LIFE), discriminant (P-scale of EPQ) and criterion validity (SCID-II). Factor analyses supported a four-factor structure in fitting SPQ data. CONCLUSIONS: Our Spanish version of the SPQ questionnaire preserved the psychometric properties of the original questionnaire. This adaptation will provide a useful tool for the early detection of prodromal schizophrenia symptoms and clinical relapse in Spanish-speaking populations.
OBJECTIVE: The need for early detection, prevention and intervention in psychosis has prompted the study of prodromal and threshold syndromes. One strategy involves the assessment of schizotypy, a personality construct involving unusual perceptual experiences, magical thinking or bizarre behavior. Sensitive measurement instruments could potentially allow detection of signs heralding transition to psychosis in high-risk individuals, or risk of relapse in patients after a first psychotic episode. The Schizotypal Personality Questionnaire (SPQ) is a self-report scale, originally developed for English speakers, that covers the nine DSM-IV criteria for schizotypal personality disorder (SPD). Our aim was to validate a Spanish version of the SPQ and assess its psychometric properties. METHODS: The original SPQ was back-translated and administered to university students (n=250). We assessed the internal consistency, the convergent, discriminant and criterion validity of the instrument, and analyzed its factor structure. RESULTS: Our version of the SPQ showed good internal consistency, and convergent (O-LIFE), discriminant (P-scale of EPQ) and criterion validity (SCID-II). Factor analyses supported a four-factor structure in fitting SPQ data. CONCLUSIONS: Our Spanish version of the SPQ questionnaire preserved the psychometric properties of the original questionnaire. This adaptation will provide a useful tool for the early detection of prodromal schizophrenia symptoms and clinical relapse in Spanish-speaking populations.