Psychometric properties of the Greek version of the Schizotypal Personality Questionnaire (SPQ) in young male obligatory conscripts: A two years test–retest study

The aim of this paper was the assessment of the psychometric properties of the Greek version of the Schizotypal Personality Questionnaire (SPQ), within the Athens Study of Psychosis Proneness and Incidence of Schizophrenia (ASPIS). The Greek version was administered to 1355 young male conscripts in the Greek Air Force. The Perceptual Aberration Scale (PAS) and Symptom Check List-90-Revised (SCL-90-R) were also included in the study in order to evaluate convergent and discriminant validity. Two years later the SPQ was re-administered to 145 of the conscripts followed by the Structured Interview for DSM-III-R Personality Disorders (SCID-II). The Greek SPQ version replicated the original author’s high internal reliability findings (0.91) providing evidence of convergent (0.70), discriminant (0.32–0.47) and criterion (0.81) validity. The stability estimator of the SPQ was found to be 0.53 while negative schizotypal features appeared to be more stable over time than positive ones. Thirty three percent of the individuals over the 90th percentile of the total SPQ score had a clinical diagnosis of Schizotypal Personality Disorder (SPD) via the SCID-II interview, while none of the remaining individuals appeared to have this disorder.