Reliability and normative data of the Perceptual Aberration Scale in an Italian juvenile general population sample

Psychometric tools, such as the Perceptual Aberration Scale (PAS), have been developed to identifypeople at risk to develop psychosis. This paper aims at providing an Italian version of the PerceptualAberration Scale and its normative data for the general juvenile Italian population. The Italian version ofthe PAS was produced using three independent translators. It was administered to 1089 non-clinicalparticipants, stratified into three age-groups, i.e., 8–13, 14–17 and 18–24. The Italian version of the PASdisplayed good internal consistency in each age-group evaluated (i.e. Alpha Coefficients: 0.90 for the 8–13 age-group, 0.84 for the 14–17 age-group, and 0.87 for the 18–24 age-group) and the assumption ofunidimensionality was corraborate. Furthermore, normative data for the three groups were collected (i.e.cut-offs: 25 for the 8–13 age-group, 21 for the 14–17 age-group and 20 for the 18–24 age-group) and anage-related difference, as the 18-24 group scored lower than the younger groups, was found. The Italianversion of the PAS proved to be a reliable psychometric tool to investigate perceptual aberration duringchildhood, adolescence and young adulthood.