Retrospective bullying trajectories in adults with self-reported oral language difficulties.

BACKGROUND: Previous research has consistently evidenced that children with speech and language difficulties suffer more bullying victimisation during middle school years, whereas other educative stages remain less explored. Moreover, there are divergent results in previous evidence about the types of victimisation (physical, verbal, relational) youths may experience. AIMS: To examine the retrospective developmental trajectories of bullying victimisation in adults with and without self-reported oral language difficulties across seven educational stages (preschool to university). Special attention was given to the prevalence and types of victimisation. METHODS & PROCEDURES: A total of 336 participants (ages between 18 and 65, M = 30.3) from a sample of 2259 participants that fully answered an online survey were classified as having experienced oral language difficulties (LD) not associated with a biomedical condition. A comparable control group (n = 336; ages between 18 and 72, M = 30.0) was randomly selected for statistical between-groups contrasts. Responses to the California Bullying Victimization Scale-Retrospective (CBVS-R) were analysed by generalised estimating equations (GEE) including language groups, types of bullying, and educational stages as explanatory variables. Specific language group comparisons in terms of percentages were conducted using chi-square tests. OUTCOMES & RESULTS: GEE results suggested that experiencing LD was associated with an overall increase in the likelihood of bullying victimisation, Wald's χ2 (1) = 8.41, p < 0.005 for the main effect of the LD group, along almost all educational stages, Wald's χ2 (6) = 3.13, p = 0.69 for the LD group × educational stage interaction. Finally, a higher proportion of participants in the LD group reported having suffered teasing behaviours at the second cycle of elementary, the first cycle of secondary, and baccalaureate. They also reported with a higher proportion being physically hurt at preschool and having received sexual comments at the second cycle of elementary, Wald's χ2 (93) = 259.87, p < 0.001 for the LD group × educational stage × type of bullying interaction. CONCLUSIONS & IMPLICATIONS: People with oral language difficulties experience more bullying victimisation behaviours than their typically developing peers. Heightened bullying prevalence in children with language difficulties seems to emerge as early as 6-9 years old and persists along the rest of schooling. Not all victimisation forms seem to show differential increased rates in people with speech/language difficulties, evidencing important implications for bullying assessment. Results highlight the need to provide particular support to individuals with language difficulties against bullying during the entire schooling.

California Bullying Victimization Scale-Retrospective (CBVS-R): Validation of the Spanish Adaptation.

BACKGROUND: Bullying in childhood and adolescence is a worldwide problem. There is a general lack of validated retrospective measures of bullying, especially in Spanish-speaking populations. The present study aimed to adapt the retrospective version of the California Bullying Victimization Scale (CBVS-R) to Spanish and examine its psychometric properties. METHOD: The CBVS-R was translated and adapted into Spanish, and school victimization was evaluated in a sample of 1,855 Spanish adults (69.3% women). Factor structure, test-retest reliability, and predictive validity were explored. The types of victimization by educational level and the total victimization score for each participant were analyzed. RESULTS: Factor analysis showed a one-factor structure. Values of internal consistency (α = .80) and test-retest reliability ( r = .87, k = .73) were satisfactory. Victimization was associated with self-reports of mental health. Victimization patterns peaked around adolescence, the most frequent victimizing behavior was being teased or called names. CONCLUSIONS: Results support the usefulness and suitability of the Spanish adaptation of the CBVS-R as a retrospective self-report measure of bullying victimization in adults.

California Bullying Victimization Scale-Retrospective (CBVS-R): Validation of the Spanish Adaptation / California Bullying Victimization Scale-Retrospective (CBVS-R): Validación de la Adaptación Española

Background: Bullying in childhood and adolescence is a worldwide problem. There is a general lack of validated retrospective measures of bullying, especially in Spanish-speaking populations. The present study aimed to adapt the retrospective version of the California Bullying Victimization Scale (CBVS-R) to Spanish and examine its psychometric properties. Method: The CBVS-R was translated and adapted into Spanish, and school victimization was evaluated in a sample of 1,855 Spanish adults (69.3% women). Factor structure, test-retest reliability, and predictive validity were explored. The types of victimization by educational level and the total victimization score for each participant were analyzed. Results: Factor analysis showed a one-factor structure. Values of internal consistency (α = .80) and test-retest reliability (r = .87, κ = .73) were satisfactory. Victimization was associated with self-reports of mental health. Victimization patterns peaked around adolescence, themost frequent victimizing behavior was being teased or called names. Conclusions: Results support the usefulness and suitability of the Spanish adaptation of the CBVS-R as a retrospective self-report measure of bullying victimization in adults. (AU)

Antecedentes: el acoso escolar o bullying es un problema generalizado en la infancia y la adolescencia a nivel mundial. Existen pocas medidas retrospectivas de bullying validadas, especialmente en población de habla hispana. El objetivo del presente estudio fue adaptar al español la versión retrospectiva de la California Bullying Victimization Scale (CBVS-R) y examinar sus propiedades psicométricas. Método: se tradujo y adaptó al español la CBVS-R y se evaluó la victimización escolar en una muestra de 1.855 adultos españoles (69,3% mujeres). Se exploró la estructura factorial, la fi abilidad test-retest y su validez predictiva. Se analizaron los tipos de victimización por niveleducativo y la puntuación total de victimización para cada participante. Resultados: el análisis factorial mostró una estructura unifactorial.Los valores de consistencia interna (α = .80) y fiabilidad test-retest (r = .87, κ = .73) fueron satisfactorios. La victimización estuvo asociada con medidas autoinformadas de salud mental. Los patrones de victimización mostraron su valor más elevado en torno a la adolescencia, siendo la conducta más frecuente ser objeto de burla o insultos. Conclusiones: los resultados respaldan la utilidad y conveniencia de la adaptación española del CBVS-R como autoinforme retrospectivo de victimización por acoso escolar en adultos. (AU)

Optimization of the xylan degradation activity of monolithic enzymatic membranes as a function of their composition using design of experiments.

The aim of this work was the development and optimization of enzymatic monolithic membranes with high catalytic activity for the degradation of xylan into xylooligosaccharides. The chemometric tool design of experiments has been utilized here for the first time for the optimization of the enzymatic activity of the monolithic membranes based on their constituents. The effect of three process variables, including the amount of various monomer contents and the porogenic solvents ratio, has been studied on the enzymatic activity of the resulted membranes. The experimental design chosen was a central face centred with six central points in order to obtain an orthogonal model, with the precision of the results being independent of the range of values considered for each parameter. The software Modde(c) 6.0 from Umetrics(c) was used to build and analyze the results of the experimental design using partial least squares regression. The optimization of the suggested model provided the best membrane composition to achieve maximum enzymatic activity, which can be related to the amount of enzyme immobilized on the monolithic membrane. The predictive capacity of the model was evaluated performing additional experiments.