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Spanish adaptation of the Green Paranoid Thought Scales

2015; Cologio Oficial de Psicólogos del Principado; Volume: 1; Issue: 27 Linguagem: Inglês

10.7334/psicothema2014.103

0214-9915

Inmaculada Ibáñez-Casas, Pedro Femia, José‐Luis Padilla, Catherine Green, Enrique Portugal, Jorge A. Cervilla,

Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes

The aim of this study was to adapt and obtain validity evidence of the Spanish Green Paranoid Thought Scales (S-GPTS).191 Spanish people responded to S-GPTS, Peters Delusions Inventory (PDI), and measures of psychopathology.Principal Component Analyses on the polychoric correlation matrix identified two factors accounting for 71.0% of the cumulative variance. Cronbach alphas for S-GPTS total and its subscales were above .90 in clinical and non-clinical group. The value of the area under the receiver operating characteristic curve was higher for the S-GPTS (.898), than for the PDI (.859). The best S-GPTS threshold to discriminate between cases and non-cases was 92 (sensitivity, 97.35%; specificity, 65%). S-GPTS scores positively correlated with PDI and measures of anxiety and depression.The S-GPTS has adequate psychometric properties to provide valid measures of delusional ideation in a Spanish population.