Nafsika Ziavra

Prof. Dr. Nafsika Ziavra

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Research Focus & Metrics

Academic Career Length

7Years (2020-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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19 July 2023 in Brain Sciences
Verified
Journal Article
Open access
PDF file
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
VSVassiliki Siafaka
Vassiliki Siafaka
LVLouiza Voniati
Louiza Voniati
APAlexandra Prentza
Alexandra Prentza
Angelos PapadopoulosAngelos Papadopoulos
Angelos Papadopoulos
SKSpiros Konitsiotis
Spiros Konitsiotis
One of the components of a dementia diagnosis is the assessment of functional abilities. These abilities are measured via screeners, such as the Instrumental Activities of Daily Living (IADL) scale. The IADL scale is a valid tool that has been adapted in many languages. This study aimed to provide a cut-off point and validate the Greek version of the IADL scale in populations with cognitive impairment. IADL data were collected from 132 individuals: 24 PD patients, 24 Parkinson’s disease dementia (PDD) patients, and 24 AD patients. The remaining 60 participants were cognitive healthy adults (CHAs). The CHA group and the PD group served as the cognitively unimpaired group (CUG), while the PDD and AD groups served as the cognitively impaired group (CIG). Additionally, the MMSE, the AMTS, the Clock Drawing Test CDT, the Arizona Battery for Communication Disorders of Dementia (ABCD), the NPI, and the GDS-15 were administered to the participants. Statistically significant differences in the IADL scores were exhibited between all subgroups. The IADL scale showed high internal consistency (Cronbach’s alpha = 0.890). A threshold equal to 6.00 (AUC = 0.888, p < 0.001) was estimated between the CUG and the CIG. Significant positive correlations were observed between IADL and MMSE (r = 0.764, p < 0.001), IADL and AMTS (r = 0.724, p < 0.001), IADL and ABCD (r = 0.702, p < 0.001), and IADL and CDT (r = 0.627, p < 0.001) results. Given the obtained results, the IADL scale is a valid tool for clinical use with high reliability and sensitivity. Also, the IADL scale is a valuable instrument for screening functional abilities associated with cognitive impairment.

15 March 2024 in Disability and Rehabilitation
Verified
Journal Article
Open access
RGRafaella Georgiou
Rafaella Georgiou
APAndri Papaleontiou
Andri Papaleontiou
LVLouiza Voniati
Louiza Voniati
VSVassiliki Siafaka
Vassiliki Siafaka
NZNafsika Ziavra
Nafsika Ziavra
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
Pediatric dysphagia is defined as a disorder of the swallowing sequence that results in difficulties compromising the safety, efficiency, or adequacy of nutritional intake in children [1–3]. Moreov...

29 October 2020 in Applied Neuropsychology: Adult
Verified
Journal Article
Closed access
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
NZNafsika Ziavra
Nafsika Ziavra
APAlexandra Prentza
Alexandra Prentza
VSVassiliki Siafaka
Vassiliki Siafaka
Vasiliki ZarokanellouVasiliki Zarokanellou
Vasiliki Zarokanellou
SKSpiros Konitsiotis
Spiros Konitsiotis
Screening people’s cognitive skills have been proven essential for reference to full assessment. These methods include short scales, such as the Abbreviated Mental Test Score (AMTS). The AMTS is a valid 10-item questionnaire that has been translated into many languages, but not in Greek yet. The aim of this study is the validation of the Greek version of the AMTS with an additional estimation of its cutoff scores. About 132 individuals [60 controls and 72 patients (24 with Parkinson’s disease (PD), 24 with Parkinson’s disease dementia (PDD), and 24 with Alzheimer’s disease (AD)] participated in this study. All participants besides the AMTS completed the Mini Mental State Examination (MMSE), the Tuokko’s Clock Drawing Test (CDT), the Instrumental Activities of Daily Living (IADL), the Arizona Battery for Communication Disorders of Dementia (ABCD), the Hellenic versions of the Neuropsychiatric Inventory (NPI), and the Geriatric Depression Scale (GDS-15). Statistically significant differences were found between all subgroups for the AMTS. The AMTS showed high internal consistency (Cronbach alpha = 0.819 and coefficient omega ω = 0.814). A threshold equal to 6.50 (AUC: 0.908, p = 0.000) between groups with and without cognitive impairment was calculated. The AMTS was significantly correlated with the CDT, IADL, and MMSE. The proposed version of the AMTS can distinguish between groups with and without cognitive impairment. Additionally, the AMTS is found to be clinically valid having high reliability and classification accuracy. Conclusively, it is a valuable instrument for screening different types of cognitively impaired patients.

15 July 2025 in Brain Sciences
Verified
Journal Article
Open access
PDF file
LVLouiza Voniati
Louiza Voniati
Angelos PapadopoulosAngelos Papadopoulos
Angelos Papadopoulos
NZNafsika Ziavra
Nafsika Ziavra
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
Background/Objectives: Rett syndrome (RTT) is a rare neurodevelopmental disorder that affects movement and communication skills primarily in females. This study aimed to synthesize the research from the last two decades regarding the verbal and nonverbal communication abilities, assessment procedures, and intervention approaches for individuals with RTT. Methods: A structured literature search was conducted using the Embase, Scopus, and PubMed databases. Fifty-seven studies were selected and analyzed based on inclusion criteria. The data were categorized into four domains (verbal communication skills, nonverbal communication skills, assessment procedures, and intervention approaches). Results: The findings indicated a wide variety of communicative behaviors across the RTT population, including prelinguistic signals, regression in verbal output, and preserved nonverbal communicative intent. Moreover, the results highlighted the importance of tailored assessments (Inventory of Potential Communicative Acts, eye tracking tools, and Augmentative and Alternative Communication) to facilitate functional communication. The individualized intervention approaches were found to be the most effective in improving communicative participation. Conclusions: The current review provides an overview of the current evidence with an emphasis on the need for personalized and evidence-based clinical practices. Additionally, it provided guidance for professionals, clinicians, and researchers seeking to improve the quality of life for individuals with RTT.

3 May 2024 in Journal of Autism and Developmental Disorders
Verified
Journal Article
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Vasiliki ZarokanellouVasiliki Zarokanellou
Vasiliki Zarokanellou
EPEvridiki Papagiannopoulou
Evridiki Papagiannopoulou
AGAlexandros Gryparis
Alexandros Gryparis
VSVassiliki Siafaka
Vassiliki Siafaka
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
NZNafsika Ziavra
Nafsika Ziavra
Purpose: The present study investigates healthcare students’ affective, behavioral, and cognitive attitudes toward hypothetical peers with autism spectrum disorder (ASD) and the effect of the ASD label on their attitudes. Methods: The MAS scale for ASD persons in the postsecondary education (Matthews et al., 2015) was translated and adapted in Greek according to the guidelines of World Health Organization (2016). Participants (n = 444) were randomly divided into three equal groups and completed their demographic information. Each participant read the three vignettes of the Greek-adapted MAS scale describing a communicative interaction with one hypothetical fellow student with autistic characteristics in three different social situations but in each group, the vignette’s character was labeled differently (High-functioning, typical college student, and no-label). Results: Students in the High-functioning group demonstrated more positive affective, behavioral, and cognitive attitudes toward the vignette characters than students in the no-label condition. Furthermore, students in the typical student group reported more rejective behaviors toward the vignette characters than students in the high-functioning group, implying that atypical behavior evokes rejection and stigmatization, while the label did not. Male students presented more positive cognitive attitudes across study groups in comparison to female students, while previous contact with individuals with ASD did not seem to impact significantly attitudes. Conclusion: The findings of the study indicate that knowledge of an ASD diagnosis leads to greater acceptance and have important implications for future research, disability policy makers, and university support services.

26 November 2021 in Journal of Clinical and Experimental Neuropsychology
Verified
Journal Article
Closed access
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
NZNafsika Ziavra
Nafsika Ziavra
APAlexandra Prentza
Alexandra Prentza
VSVassiliki Siafaka
Vassiliki Siafaka
Vasiliki ZarokanellouVasiliki Zarokanellou
Vasiliki Zarokanellou
SKSpiros Konitsiotis
Spiros Konitsiotis
The present study aims to be the first to validate the Tuokko version of the Clock Drawing Test (CDT) and estimate its cutoff score after its translation into the Greek language and administration ...