Yazar "Kizilkaya, Fatma" seçeneğine göre listele

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    Cyberchondria and Anxiety Sensitivity in Patients with Panic Disorder: A Case-Control Study
    (Mdpi, 2026) Orman, Kubra; Sun, Tunahan; Ugur, Kerim; Kizilkaya, Fatma
    Background and Objectives: Cyberchondria (CYB) has been associated with health anxiety and anxiety sensitivity (AS); however, its role in panic disorder (PD) remains unclear. This study aimed to compare CYB and AS levels between patients with PD and healthy controls and to examine their associations with PD severity. Materials and Methods: This cross-sectional case-control study included 71 patients with PD and 69 age- and sex-matched healthy controls. Participants completed the Cyberchondria Severity Scale (CSS), Anxiety Sensitivity Index-3 (ASI-3), and Beck Anxiety Inventory (BAI). PD severity was assessed using the Panic Disorder Severity Scale (PDSS). Group comparisons were additionally conducted using analysis of covariance (ANCOVA), controlling for relevant sociodemographic and clinical variables. Pearson correlation and hierarchical multiple regression analyses were performed. Results: Patients with PD had significantly higher CSS (80.70 +/- 22.71 vs. 60.62 +/- 17.22) and ASI-3 total scores (35.66 +/- 17.87 vs. 12.25 +/- 10.18) than healthy controls. In the PD group, CYB was positively correlated with AS (r = 0.38, p < 0.01), whereas no significant association was found between CYB and PD severity (r = 0.09, p > 0.05). AS showed a moderate positive correlation with PD severity (r = 0.46, p < 0.01). In hierarchical regression analyses, CYB did not predict PD severity. Adding AS significantly increased the explained variance; however, in the final model, only general anxiety severity (BAI) remained a significant predictor of PD severity. Conclusions: Patients with PD exhibit elevated levels of CYB and AS, which are positively associated with each other. Nevertheless, PD severity appears to be primarily driven by general anxiety symptoms rather than CYB. These findings suggest that CYB may represent a parallel maladaptive coping behavior rather than a direct determinant of symptom severity, with potential implications for assessment and intervention. Longitudinal studies are warranted to clarify causal relationships.
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    Does geopolitical risk escalate environmental degradation in Turkey? Evidence from a Fourier approach
    (Springer, 2026) Kizilkaya, Fatma; Kizilkaya, Oktay; Mike, Faruk
    This study examines the long-run impacts of geopolitical risk on carbon dioxide (CO2) emissions in Turkey using Shin and Fourier Shin cointegration methods for yearly observations from 1985 to 2019. The cointegration test results reveal a long-run relation between CO2 emissions and geopolitical risk, economic growth, renewable energy, and the population size in Turkey. According to dynamic ordinary least squares estimation, geopolitical risk and renewable energy consumption have negative and statistically significant impacts on CO2 emissions, whereas economic growth and population size have positive and statistically significant effects on CO2 in the long-run. This shows that increases in geopolitical risks tend to reduce CO2 emissions in Turkey, by depressing production in polluting industries as well as economic growth. In addition, the study performs TY and Fourier TY causality analyses to check for consistency (or robustness) in the cointegration results. Accordingly, the Fourier TY test results demonstrate a unidirectional relationship from geopolitical risk and population size to CO2 emissions, whereas the Toda-Yamamoto test procedure indicates no causal relationship between the series in the long run. Overall, increases in geopolitical risks decrease the rate of production and pollution in the polluting sector in Turkey. However, this also means a decrease in economic growth rates for Turkey which focuses its economic policy and strategy on sustainable growth and development. Therefore, it is very important for Turkey to immediately implement an environmental practice that will not harm its economic policies.
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    Unemployment hysteresis in Central and Eastern European countries during EU-membership
    (Akademiai Kiado Zrt, 2024) Kizilkaya, Oktay; Mike, Faruk; Kizilkaya, Fatma
    This study aims to analyse the time series properties of the unemployment rates in 10 Central and Eastern European countries after joining the European Union. Three types of unit root tests were conducted: (1) linear unit root tests, namely ADF, PP, LM, and RALS-LM tests; (2) LM and RALS-LM unit root tests with two structural breaks; and (3) LM and RALS-LM unit root tests with Fourier function. The results reveal that the hysteresis hypothesis is valid for Bulgaria, Czechia, Hungary, Latvia, Lithuania, Romania and Slovenia, whereas the structuralist hypothesis is valid for Estonia and Poland. However, the natural rate hypothesis holds only for Slovakia.