Adaptation into Turkish, reliability and validity of borderline personality inventory
Aydemir, O. (2006) Adaptation into Turkish, reliability and validity of borderline personality inventory. Psychiatry in Turkiye, 8 (1). pp. 6-10. ISSN 1302-2466
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Objective: Borderline personality organization/disorder is a psychopathology which should be diagnosed since it can both cause disability and worsen the prognosis of other disorders in psychiatric daily practice. Borderline Personality Inventory (BPI) mostly focuses on borderline personality organization and is a 53-item self-rated scale based on Kernberg’s structural borderline organization. Since no scale on borderline personality is available in Turkey, in this study, adaptation into Turkish, and reliability and validity of Borderline Personality Inventory are tested. Method: The inventory was first translated into Turkish by three psychiatrists, secondly it was back-translated by a linguist into English, and then the final text was confirmed by the psychiatrists. The study was carried out with 40 patients diagnosed as borderline personality disorder, 35 patients as major depressive disorder and 30 patients as schizophrenia according to DSM-IV, and 61 healthy subjects. Results: Mean age of the study group was 28.2±10.3. In reliability analyses, Cronbach alpha coefficient of the whole group was 0.92, and for the borderline personality disorder group it was 0.84. Test-retest correlation was found to be r=0.67 (p<0.002). In validity analyses, criterion validity was calculated; and in ROC analysis, a cut-off point of 15/16 was obtained with a sensitivity of 80.0% and specificity of 79.3%. Positive predictive value for this cut-off point was 55.1%, and negative predictive value was 92.5%. Mean total score of BPI of each diagnostic group was 23.2±8.3 for borderline personality disorder, 12.3±7.7 for major depressive disorder, 11.0±8.1 for schizophrenia, and 5.1±3.7 for healthy subjects, and the difference was statistically significant (p<0.0001). BPI discriminates borderline personality disorder group from other psychiatric disorder groups and from healthy control group well. Conclusion: Turkish version of Borderline Personality Inventory can be used in daily practice reliably and validly.
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