Validation of the lithuanian version of the self-evaluation of negative symptoms scale (SNS)

Abstract

Purpose: To validate the Lithuanian version of the Self-Evaluation Negative Symptoms Scale (Lith-SNS). Materials and methods: A double translation from French to Lithuanian and back was performed. We included patients from in-patient and out-patient settings that had a diagnosis of paranoid schizophrenia according to ICD-10 criteria and were screened as free from acute psychotic symptoms using the Mini International Neuropsychiatric Interview (MINI). Participants were evaluated using the Brief Psychiatric Rating Scale (BRPS) and completed the Lith-SNS scale. We measured internal consistency, convergent validity, and discriminant validity of Lith -SNS comparing its scores with BPRS negative and positive symptom subscores. Results: A total of 67 participants were evaluated. Cronbach's alpha (a) for all 20 items of Lith-SNS (a ¼ 0.82), and for the five subscores (a ¼ 0.76) showed good internal consistency. Factor analysis showed a 2-factor solution which accounted for 70.12% of the variance with the first factor accounting for 53.3% and the second factor accounting for 16.8% of the variance. Lith-SNS total scores and all five subscores significantly correlated with BPRS negative symptoms subscores showing good convergent validity. There was a correlation between the Positive subscore of BPRS and the alogia subscore of Lith-SNS (r ¼ 0.39, p ¼ 0.001), but no correlations with other subscores or the total Lith-SNS score showing adequate discriminant validity. Conclusions: Lithuanian version of SNS is a valuable tool to evaluate negative symptoms of schizophrenia with good internal consistency, convergent, and discriminant validity.

Mindfulness, cognitive fusion, and self-compassion in patients with schizophrenia spectrum disorders—A cross-sectional study

“…The mediation analysis reached significance for SNS [ R 2 = 0.12, F ( 3 , 65 ) = 3.49, p < 0.05] and PANSS as outcome measure ( R 2 = 0.13, F (3.75) = 3.26, p < 0.05). When compared to the zero-order correlations of mindfulness on total and negative symptom severity before the mediator CFQ was added, direct effects in the moderated mediation model decreased in both models (PANSS: b simple = −0.33, p < 0.1 to b model 1 = −0.24, p = 0.15; SNS: b simple = −0.13, p = 0.25 to b model 2 = −0.12, p = 0.41).…”

“…The PANSS-NS includes aspects not typically considered part of negative symptomologies, such as evaluations regarding cognitive functioning, depressive symptoms, inadequate behavior, and disorganized speech. Additionally, PANSS-NS does not address the concept of amotivation, which is considered in SNS ( 1 , 65 , 76 ). Therefore, the influence of different conceptualizations and nuances of each assessment tool should be considered in future research.…”

Validity and reliability of a Chinese version of the self‐evaluation of negative symptoms

“…Using SNS, the doctor can fully understand the five dimensions of negative symptoms in patients with schizophrenia; thereby, the doctor can gain more information to initiate a better tailored treatment strategy for patients with schizophrenia (Dollfus et al, 2016;Polat et al, 2022). Although SNS is a commonly used tool globally (García-Álvarez et al, 2022;Hajj et al, 2020;Montvidas et al, 2020;Polat et al, 2022;Rodrguez-Testal et al, 2019), to our knowledge, this Chinese version of SNS lacks the scope for better schizophrenia treatment. Hence, in this study, we aimed to examine the reliability and validity of the Chinese version of SNS in a group of Chinese-speaking patients with schizophrenia.…”

Correlation of Health-Related Quality of Life with Negative Symptoms Assessed with the Self-Evaluation of Negative Symptoms Scale (SNS) and Cognitive Deficits in Schizophrenia: A Cross-Sectional Study in Routine Psychiatric Care

“…It only takes around 5 min to complete and score the SNS. The Lithuanian version of SNS has been validated and shown good psychometric properties [38].…”