Browsing by Author "Barut, Yasar"

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Diagnostic Performance of the Turkish Version of the Vancouver Obsessional Compulsive Inventory (Voci) Versus Padua Inventory-Revised (pi-R): a Validation Study
(Kure Iletisim Grubu A S, 2015) Boysan, Murat; Gulec, Mustafa; Deveci, Erdem; Barut, Yasar
Objective: The Vancouver Obsessional Compulsive Inventory (VOCI) is a self-report inventory developed to assess a wide range of obsessive-compulsive symptoms, including contamination (12 items), checking (6 items), obsessions (12 items), hoarding (7 items), just right (12 items), and indecisiveness (6 items). The English version of the VOCI has been shown to be a promising psychometric instrument, as have its French, Italian, and Spanish versions. The aim of this study was to investigate psychometric properties of the Turkish version of the VOCI in clinical and non-clinical samples. Method: A questionnaire package including the VOCI, Padua Inventory-Revised (PI-R), Obsessional Beliefs Questionnaire (OBQ), and Beck Depression Inventory (BDI) was administered to volunteer undergraduates (n=365) and patients with obsessive-compulsive disorder (OCD) (n=46). Psychometric analyses were run to assess reliability and validity of the Turkish version of the VOCI. We converged a confirmatory factor analysis to test the factor structure. We also performed a receiver operating characteristic (ROC) analysis to determine cut-off scores and compared the diagnostic performance of the VOCI and PI-R. Convergent and discriminant validity of the VOCI were assessed through Pearson product-moment correlation coefficients. Internal consistency and temporal reliability were computed. Results: Confirmatory factor analysis replicated the original six-factor structure. The maximum likelihood factor loading estimates were higher than 0.40. OCD patients scored significantly higher than control subjects on the contamination, checking, obsessions, things just right, and indecisiveness subscales of the VOCI but not on the hoarding subscale. The global VOCI scores highly correlated with the PI-R (r=0.89); correlation between the contamination subscale of the VOCI and washing subscale of the PI-R was r=0.88; correlation between the checking subscales of both screening tools was r=0.83; correlation between the just right subscale of the VOCI and precision subscale of the PI-R was r=0.71; and correlation between the obsession subscale of the VOCI and rumination subscale of the PI-R was r=0.71. Divergent validity of the VOCI was also high, so that correlations of the total and subscales of the VOCI with the total and subscales of the PI-R were from r=0.25 to a high of r=0.41; therefore, it can be said that the coefficients ranged from weak to moderate. These correlation coefficients were indicative of good convergent and divergent validity. Internal consistency of the VOCI global was 0.97, and that of the VOCI subscales ranged between 0.82 and 0.92 in the overall sample. Cronbach's Alphas of the VOCI subscales in the OCD group were between 0.73 and 0.88, and in the control group between 0.84 and 0.92. Fifteen-day test-retest intra-correlations for total scores of the VOCI were 0.75; for the subscales they ranged from 0.68 up to 0.88. The ROC analysis demonstrated a moderate diagnostic performance for the VOCI cut-off score of 87.5 with a sensitivity of 0.74 and a specificity of 0.73 immediately comparable to the PI-R cut-off point of 67.5. Conclusion: The VOCI had good internal consistency, test-retest reliability, convergent and discriminant validity. It is concluded that the Turkish version of the VOCI has sound psychometric properties. Further studies are needed to develop psychometric tools with stronger diagnostic performance for OCD assessment.
Psychometric Properties of the Turkish Version of the Internet Addiction Test (Iat)
(Pergamon-elsevier Science Ltd, 2017) Boysan, Murat; Kuss, Dania J.; Barut, Yasar; Aykose, Nafi; Gulec, Mustafa; Ozdemir, Osman
Objective: Of many instruments developed to assess Internet addiction, the Internet Addiction Test (IAT), an expanded version of the Internet Addiction Diagnostic Questionnaire (IADQ), has been the most widely used scale in English and non-English speaking populations. In this study, our aim was to investigate the psychometric properties of short and expanded versions of the IAT in a Turkish undergraduate sample. Method: Overall, 455 undergraduate students from Turkey aged between 18 and 30 participated in the study (63.53% were females). Explanatory and confirmatory factor analytic procedures investigated factor structures of the IADQ and IAT. The Internet Addiction Scale (IAS), Coping Inventory for Stressful Situations (CISS), Obsessive,Compulsive Inventory Revised (OCI-R) and Dissociative Experiences Scale (DES) were administered to assess convergent and divergent validities of the IADQ and IAT. Internal consistency and 15-day test-retest reliability were computed. Results: In the factorial analytic investigation, we found a unidimensional factor structure for each measure fit the current data best. Significant but weak to moderate correlations of the IADQ and the IAT with the CISS, OCI-R and DES provided empirical evidence for divergent validity, whereas strong associations with the subscales of the IAS pointed to the convergent validity of Young's Internet addiction construct. Internal consistency of the IADQ was weak (alpha = 0.67) and of the IAT was high (alpha = 0.93). Temporal reliability of both instruments was very high (alpha = 0.81 and alpha = 0.87; respectively). Conclusion: The IAT revealed promising and sound psychometric properties in a Turkish sample. (C) 2015 Elsevier Ltd. All rights reserved.
Psychometric Properties of the Turkish Version of the Posttraumatic Cognitions Inventory (Ptci) in a Non-Clinical Sample
(Turkish Neuropsychiatry Assoc-turk Noropsikiyatri dernegi, 2013) Gulec, Mustafa; Kalafat, Temel; Boysan, Murat; Barut, Yasar
Background: Cognitive theories of posttraumatic stress disorder have increasingly been recognised. The Posttraumatic Cognitions Inventory is a promising self-report instrument to assess negative cognitions associated with posttraumatic distress. Method: In this study, we examined the psychometric properties of the Posttraumatic Cognitions Inventory in 653 non-clinical Turkish college students. 185 participants reported having experienced various types of trauma. Results: Confirmatory factor analyses replicated the original three-factor structure without excluding any items. Total and subscale scores of the instrument revealed strong connections with severity of depression, anxiety, and dissociative symptoms. Concurrent validity of the Self-Blame subscale was specific to subtype of trauma. The total and the subscales of the instrument had high internal consistency and adequate temporal stability over a two-week interval with an exception of the Self-Blame subscale. The correlation coefficient between the two applications was extremely low for the subscale. Conclusion: We assume that the Self-Blame subscale fails to perform well among individuals who had experienced an aversive event other than interpersonal trauma. The PTCI revealed adequate reliability and validity in a nonclinical Turkish sample.
Psychometric Properties of the Turkish Version of the Ptsd Symptom Scale-Self (pss-Sr)
(Cumhuriyet Univ Tip Fak Psikiyatri Anabilim Dali, 2012) Aydin, Adem; Barut, Yasar; Kalafat, Temel; Boysan, Murat; Besiroglu, Lutfullah
Objective: The PTSD Symptom-Self Report Scale (PSS-SR) is a widely used psychometric instrument in studies for assessing post-traumatic symptoms. In this study, we our aim was to address the psychometric properties of the Turkish version of the PSS-SR by assessing the validity of the original three-factor structure of the scale as well as concurrent validity and reliability. Methods: Participants were 596 college students and 20 patients with PTSD experienced earthquake in Van and consequently applied to psychiatry clinic seek for treatment. 64.61 percent of the subjects were females (n=398). Mean age of the participants was 21.81 +/- 2.78. In the study, subjects were administered the PSS-SR, Impact of Event Scale (EIS-R), Dissociative Experiences Scale (DES), Beck Depression Inventory (BDI), and Beck Anxiety Inventory (BAI). Validity of the original three-factor structure of the PSS-SR was assessed by using confirmatory factor analysis. Correlations between scores of the instrument and other psychological variables were calculated. Internal consistency and 15-day test-retest reliability of the instrument were assessed. Results: Findings obtained with confirmatory factor analysis replicated the validity of the original three-factor structure. Significant linkages of total and subscale scores of the PSS-SR to other psychological variables provided additional evidence for construct validity of the instrument. Internal consistency for total scale was 0.90 and for subscales ranged between 0.72-0.82. 15-day temporal stability coefficient for total scale was 0.66. Conclusion: The Turkish translation of the PSS-SR has adequate validity and reliability. (Anatolian Journal of Psychiatry 2012;13:125-130)