Browsing by Author "Sarisoy, G"

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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?
    Pazvantoglu, Ö; Simsek, ÖF; 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.
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    Reliability and Validity of Subjective Well-Being Under Neuroleptics Scale-Short Form-Turkish Version
    Pazvantoglu, O; Simsek, OF; Aydemir, O; Sarisoy, G; Korkmaz, IZ; Mor, S; Boke, O; Ucok, A
    Reliability and validity of subjective well-being under neuroleptics scale-short form, Turkish version Objective:The Subjective Well-Being Under Neuroleptics Scale (SWNS) is a self-reported measure that evaluates the state of well-being of schizophrenis patients using antipsychotic drugs independently of psychotic symptoms. This study was intended to establish the validity and reliability of the Turkish version of the scale. Methods: The Cronbach alpha coefficient was calculated for reliability analysis of the scale, which was translated into Turkish and applied to 103 schizophrenia patients. The criterion validity was examined by correlation with reference scales (Turkish Version of the Functional Remission of General Schizophrenia, The Short Form of the World Health Organization Quality of Life) concurrently in use. The construct validity of the scale was assured using both exploratory and confirmatory factor analyses. Findings: The Turkish version of the scale was found to have a high reliability co-efficient (0.881). In terms of total scores, the correlation with other scales is medium-good. However, the results of the Turkish version factor analysis were incompatible with the sub-dimensions of the original scale. Conclusions: Our findings show that the Turkish version of this scale is a valid and reliable tool in the evaluation of states of subjective well-being of schizophrenic patients using antipsychotic drugs. On the other hand, we recommend that studies to be conducted in Turkey use only the scale total score.
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    Executive dysfunction and cognitive subgroups in a large sample of euthymic patients with bipolar disorder
    Bora, E; Hidiroglu, C; Özerdem, A; Kaçar, ÖF; Sarisoy, G; Arslan, FC; Aydemir, Ö; Tas, ZC; Vahip, S; Atalay, A; Atasoy, N; Atesci, F; Tümkaya, S
    Bipolar disorder (BP), at the group level, is associated with significant but modest cognitive deficits, including executive dysfunction. Among executive functions, response inhibition deficits have been suggested to be particularly relevant to BR However, BP is associated with significant heterogeneity in neurocognitive performance and level of functioning. Very few studies have investigated neurocognitive subgroups in BP with data-driven methods rather than arbitrarily defined criteria. Other than having relatively small sample sizes, previous studies have not taken into consideration the neurocognitive variability in healthy subjects. Five hundred-fifty-six euthymic patients with BP and 416 healthy controls were assessed using a battery of cognitive tests and clinical measures. Neurocognitive subgroups were investigated using latent class analysis, based on executive functions. Four neurocognitive subgroups, including a good performance cluster, two moderately low-performance groups, which differ in response inhibition and reasoning abilities, and a severe impairment cluster were found. In comparison to healthy controls, BP patients were overrepresented in severe impairment cluster (27% vs 5.3%) and underrepresented in good performance cluster. BP patients with lower educational attainment and older age were significantly more likely to be members of cognitively impaired subgroups. Antipsychotic use was less common in good performance cluster. These results suggest that there is a considerable overlap of cognitive functions between BP and healthy controls. Neurocognitive differences between BP and healthy controls are driven by a subgroup of patients who have severe and global, rather than selective, cognitive deficits. (C) 2016 Elsevier B.V. and ECNP. All rights reserved.