A VALIDATION STUDY OF TELUGU VERSION OF PETER'S DELUSIONAL INVENTORY SCALE (PDI-21)

Abstract

Background: For assessing the delusional ideation in the general community population, regional language instruments are immensely valuable. This study describes the translation of Peter's Delusional inventory (PDI-21) language and its validation in an urban community.Aim:To translate, validate and examine the effectiveness of telugu version of Peter's Delusional inventory scale (PDI-21). Materials and methods: The Telugu version of PDI was administered in 40 normal and healthy subjects selected through convenient sampling. Subjects with no mental illness are included in the study. ROC (receiver operating characteristics) analysis was carried out to assess the screening capability of scale. Sensitivity and Specicity of the instrument and the optimal cut-off for delusional ideation was determined. Results: A total of 40 subjects formed the original sample (male: female=12:28). Total 14 subjects were found to be having delusional ideation. Among them 5 subjects had high scores on subscales of preoccupation, distress and conviction indicating high delusional proneness. The optimal cut-off score for delusional proneness was 1.5, subjects having scores >1.5 are prone for delusions. Sensitivity and specicity of PDI-21 was 100% and 97.4% respectively. The area under ROC curve was 0.993. Conclusion: The telugu version of Peter's Delusional inventory (PDI-21) can be a useful, culturally agreeable, simple to use, sensitive and valid instrument for assessment of delusional ideation in normal population.