Browsing by Author "Üçok A."

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    The validation of Turkish version of personal and social performance scale (PSP); [Bireysel ve sosyal performans ölçeǧi'nin Türkçe sürümünün geçerlilik ve güvenilirlik çalişmasi]
    (2009) Aydemir Ö.; Üçok A.; Esen-Danaci A.; Canpolat T.; Karadayi G.; Emiroǧlu B.; Sariöz F.
    Objective: Functioning in severe mental disorders is very important and brief functioning rating instruments are needed. Even though patients with severe psychiatric disorders achieve symptomatic recovery, most of them cannot return to their initial level of social functioning. Personal and Social Performance Scale (PSP) is one of the instruments which can be used in severe mental disorders such as schizophrenia and takes a short time to complete. Methods: The study was performed in departments of psychiatry of two university hospitals. In- or out-patients diagnosed with schizophrenia or bipolar disorders were included in the study. The exclusion criteria were comorbidity of other psychiatric disorders including substance use disorders or of physical diseases. For concurrent validity, beside PSP, Clinical Global Impression (CGI), Global Assessment of Functioning (GAF) of DSM-IV, Quality of Life and Satisfaction Questionnaire (QLS-Q), and Positive and Negative Syndrome Scale (PANSS) were used. For discriminant validity, the mean scores of PSP in patients with and without symptomatic remission were compared. Results: The study was carried out with a total of 135 patients, 105 (77.8%) patients diagnosed with schizophrenia and 30 (22.2%) patients diagnosed with bipolar disorder. The mean age of the patients was 34.1±10.7 and 75 (55.6%) of them were male. The duration of illness was 10.4±7.5 years. The mean score of PSP was found to be 60.0±17.1. In the reliability analysis, the Cronbach alpha coefficient was calculated to be 0.8327, and item-total score correlations were found to be between 0.4920-0.7462. Intraclass correlation coefficient was calculated to be 0.8324. The inter-rater reliability of PSP performed on 30 schizophrenic patients was found to be 0.973 (p<0.0001). In the validity analyses, the total score of PSP was significantly correlated with the total score of Clinical Global Impression (CGI) (r=-0.854, p<0.0001), Global Assessment of Functioning (GAF) (r=0.748, p<0.0001), Quality of Life and Satisfaction Questionnaire (QLS-Q) (r=0.734, p<0.0001), and Positive and Negative Syndrome Scale (PANSS) (r=-0.664, p<0.0001). There was a significant difference between the patients with and without symptomatic remission (54.8±14.8 vs. 72.6±9.8, t=7.434, p<0.0001). Conclusion: The Turkish version of PSP was found to be reliable and valid in severe mental disorders and was sensitive to change. It can be used both in clinical trials and routine clinical practice.
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    Factor structure of the subjective well-being under neuroleptic treatment scale-short form in schizophrenic outpatients: Five factors or only one?
    (Informa Healthcare, 2014) Pazvantoǧlu O.; Şimşek Ö.F.; Aydemir Ö.; Sarisoy G.; Böke Ö.; Üçok A.
    Backround and aim: The Subjective Well-Being under Neuroleptics Scale, short form (SWNS), is a self-report measure that evaluates the states of well-being of schizophrenia patients using antipsychotic drugs independently from psychopathology of disease. This study examined the factor structure of the Turkish version of the scale using high-level statistical analyses. Methods: The SWNS was translated into Turkish and applied to 103 schizophrenic patients. A type of multi-trait-multi-method (MTMM) confirmatory factor analysis was conducted to determine the factor structure of the Turkish version of the scale. Results: The results of factor analysis of the SWNS were incompatible with the factor structure of the original scale. A set of MTMM analyses showed distinct method effects for both positive and negative item wording in the scale. In light of these findings, the factor structure of the SWNS was determined as having a one-dimensional structure, with bias due to item wording. Conclusions: The results of the present investigation indicated that the sub-factors of the SWNS failed to emerge from the data. This study is the first to show that there is an urgent need for further examination of the factor structure of the SWNS with regard to method effects. This issue has important implications for the use of sub-factors by both researchers and practitioners. © 2014 Informa Healthcare.
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    Validation of Turkish version of brief negative symptom scale
    (Taylor and Francis Ltd, 2016) Polat Nazlı I.; Ergül C.; Aydemir Ö.; Chandhoke S.; Üçok A.; Gönül A.S.
    Objective: Negative symptoms in schizophrenia have been assessed by many instruments. However, a current consensus on these symptoms has been built and new tools, such as the Brief Negative Symptom Scale (BNSS), are generated. This study aimed to evaluate reliability and validity of the Turkish version of BNSS. Methods: The scale was translated to Turkish and backtranslated to English. After the approval of the translation, 75 schizophrenia patients were interviewed with BNSS, Positive and Negative Syndrome Scale (PANSS), Calgary Depression Scale for Schizophrenia (CDSS) and Extrapyramidal Symptom Rating Scale (ESRS). Reliability and validity analyses were then calculated. Results: In the reliability analysis, the Cronbach’s alpha coefficient was 0.96 and item-total score correlation coefficients were between 0.655–0.884. The intraclass correlation coefficient was 0.665. The inter-rater reliability was 0.982 (p < 0.0001). In the validity analysis, the total score of BNSS-TR was correlated with PANSS Total Score, Positive Symptoms Subscale, Negative Symptoms Subscale, and General Psychopathology Subscale. CDSS and ESRS were not correlated with BNSS-TR. The factor structure of the scale was consisting the same items as in the original version. Conclusions: Our study confirms that the Turkish version of BNSS is an applicable tool for the evaluation of negative symptoms in schizophrenia. © 2016 Informa UK Limited, trading as Taylor & Francis Group.
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    Reliability and validity of the Turkish version of comprehensive assessment of at risk mental states
    (John Wiley and Sons Inc, 2021) Yokuşoğlu Ç.; Ercis M.; Çağlar N.; Aydemir Ö.; Üçok A.
    Aims: To perform the validation of the Comprehensive Assessment at Risk Mental State (CAARMS) in Turkish. Methods: Sixty-five volunteers (15-24 years) were enrolled in this study. Concurrent validity was performed with Spearman's Correlation Test using Brief Psychiatric Rating Scale (BPRS). Median scores of the groups were compared using Mann-Whitney U Test. Interrater reliability was assessed by intragroup correlation coefficient method. Internal consistency was studied by the calculation of Cronbach Alfa Coefficient. Results: The correlation of the severity scores of the CAARMS with unusual thought content, suspiciousness, hallucinations and conceptual disorganization items of the BPRS showed that the concurrent validity was good. ROC analysis revealed that CAARMS could discriminate between individuals with UHR and healthy volunteers well. We found a good correlation between the raters. Internal consistency was at very high level. Conclusion: Analyses of concurrent validity, criterion validity, interrater reliability and internal consistency indicate that the Turkish version is valid and reliable. © 2020 John Wiley & Sons Australia, Ltd.
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    Validation of the Turkish version of the self-evaluation of negative symptoms scale (SNS)
    (Taylor and Francis Ltd., 2022) Polat I.; Ince Guliyev E.; Elmas S.; Karakaş S.; Aydemir Ö.; Üçok A.
    Objectives: The Self-Evaluation of Negative Symptoms Scale (SNS) is a self-report scale that evaluates a patient’s subjective experience on all five domains of the negative symptoms. This study aimed to present the adaptation and validation study of the Turkish version of SNS(SNS-TR). Methods: Seventy-five patients and 50 controls were recruited for this study. After the approval of the translation, participants were asked to fill out SNS-TR by themselves. They were interviewed with the Brief Negative Symptoms Scale (BNSS), Positive and Negative Syndrome Scale (PANSS), and Calgary Depression Scale for Schizophrenia (CDSS). Results: SNS-TR showed good internal consistency in the reliability analysis with Cronbach’s alpha= 0.873. Subscale-total score correlation coefficients were significant (p < 0.01). In the validity analyses, the total and subscale scores of SNS-TR showed positive correlations with the total and subscales of BNSS, with only one exception of BNSS lack of distress subscales. The total score of SNS-TR demonstrated a significant correlation with PANSS-total, PANSS-negative subscale, PANSS-general subscale, and CDSS scores. Confirmatory factor analysis showed acceptable values for the five-factor structure, similar to the original version. Conclusion: To conclude, our study indicates that SNS-TR is an easily applicable self-evaluation tool with good psychometric properties for assessing negative symptoms. KEY POINTS SNS is a novel and easily applicable self-report scale for examining negative symptoms in schizophrenia patients, allowing them to evaluate their subjective experience on all five domains of the negative symptoms. It shows good internal consistency (α= 0.873) which is similar to the original version (α = 0.867). Confirmatory factor analysis scores were found in acceptable ranges and SNS-TR confirm the five-factor structure. Using this scale in clinical practice would empower both the physician’s examinations and patient participation through treatment and follow-up course. © 2022 Informa UK Limited, trading as Taylor & Francis Group.