Browsing by Author "Silva, Wanderson Roberto da"
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- Body weight concerns: Cross-national study and identification of factors related to eating disordersPublication . Silva, Wanderson Roberto da; Santana, Moema de Souza; Maroco, João; Maloa, Benvindo Felismino Samuel; Campos, Juliana Alvares Duarte BoniniBody weight concerns are common among individuals with eating disorders, and this construct can be assessed using psychometric instruments. The Weight Concerns Scale (WCS) is commonly used to assess body weight concerns.
- Confirmatory factor analysis of different versions of the Body Shape Questionnaire applied to brazilian university studentsPublication . Silva, Wanderson Roberto da; Dias, Juliana Chioda Ribeiro; Maroco, João; Campos, Juliana Alvares Duarte BoniniThis study aimed at evaluating the validity, reliability, and factorial invariance of the complete (34-item) and shortened (8-item and 16-item) versions of the Body Shape Questionnaire (BSQ) when applied to Brazilian university students. A total of 739 female students with a mean age of 20.44 (standard deviation = 2.45) years participated. Confirmatory factor analysis was conducted to verify the degree to which the one-factor structure satisfies the proposal for the BSQ's expected structure. Two items of the 34-item version were excluded because they had factor weights (lambda)< 40. All models had adequate convergent validity (average variance extracted =.43-.58; composite reliability=.85-.97) and internal consistency (alpha =.85-.97). The 8-item B version was considered the best shortened BSQ version (Akaike information criterion = 84.07, Bayes information criterion = 157.75, Browne-Cudeck criterion= 84.46), with strong invariance for independent samples (Delta chi(2)lambda(7)= 5.06, Delta chi(2)Cov(8)= 5.11, Delta chi(2)Res(16) = 19.30). (C) 2014 Elsevier Ltd. All rights reserved.
- Escala de Influência dos Três Fatores (TIS) aplicada a estudantes universitários: estudo de validação e aplicaçãoPublication . Silva, Wanderson Roberto da; Maroco, J. P.; Campos, Juliana Alvares Duarte BoniniA Escala de Influência dos Três Fatores (TIS) é utilizada para avaliar a influência de aspectos sociais e familiares na aparência corporal dos indivíduos. Contudo, poucos indícios de validade de construto da TIS são apresentados. O objetivo do estudo foi estimar os indicadores psicométricos da TIS e identificar o grau de influência da mídia, pais e amigos na aparência corporal de universitários considerando diferentes características. Universitários de ambos os sexos participaram. Os indicadores psicométricos da TIS foram avaliados para cada sexo utilizando análise fatorial confirmatória. Os escores médios de cada fator da TIS foram calculados. As prevalências do grau de influência foram apresentadas. Um modelo de regressão múltiplo multivariado foi construído para verificar a relação de características de interesse com os escores dos fatores da TIS. Participaram 791 universitários (63,2% mulheres) de 18 a 40 anos. A TIS não apresentou bom ajustamento às amostras e foi refinada. Após refinamento, observou-se adequada validade e confiabilidade para mulheres e homens. Verificaram-se diferenças significativas entre os escores médios de mulheres e homens, e, nas prevalências, a maioria dos estudantes esteve na categoria baixa. A atividade laboral, o consumo de suplementos alimentares para alterar o corpo, a idade, o índice de massa corporal, a autoavaliação da alimentação e o nível de atividade física se relacionaram significativamente com os fatores da TIS. Em geral, as mulheres foram mais influenciadas pela mídia e pelos amigos do que os homens. As características amostrais identificadas como relacionadas aos fatores da TIS podem ser relevantes para inclusão em protocolos clínicos e de pesquisa
- Impact of inherent aspects of body image, eating behavior and perceived health competence on quality of life of university studentsPublication . Silva, Wanderson Roberto da; Campos, Juliana Alvares Duarte Bonini; Maroco, JoãoThe aim of this study was to assess the impact of inherent aspects of body image, eating behavior and perceived health competence on quality of life of university students. Participants completed the instruments Body Shape Questionnaire (reduced version, BSQ-8B), Male Body Dissatisfaction Scale (reduced version, MBDS-R), Three-Factor Eating Questionnaire (reduced version, TFEQ-18), Perceived Health Competence Scale (bifactorial version, PHCS-B), World Health Organization Quality of Life Questionnaire-Short Form (WHOQoL-bref) and a questionnaire for characterization of sample. Psychometric properties of instruments were previously evaluated by confirmatory factor analysis. A hypothetical model for each sex was developed and tested. In both model surveys the aspects of the body image (BSQ-8B: body shape concern; MBDS-R: musculature and general body appearance), of eating behavior (TFEQ-18: cognitive restriction, emotional eating, and uncontrolled eating) and of the perceived health competence (PHCS-B: expectations of achieving the desired health results and competence in health behaviors) were used as direct predictors on quality of life (WHOQoL-bref). The variables age, medication use for body change, food supplement use for body change, and body mass index (BMI) were inserted in the aspects of the body image. The variables course shift, initial expectation regarding the course, self-reported performance in the course, concomitant work activities to studies, and economic class were inserted into the quality of life. The model surveys were evaluated using structural equation modeling. A level of significance of 5% was used. A total of 2,198 university students (female = 63.5%), including 1,151 Brazilians and 1,047 Portuguese, participated of study (locally representative samples). The average age of women was 20.8 ± 2.4 years and of men was 21.3 ± 3.3 years. The psychometric properties of the instruments were adequate, except for the PHCS, which was adjusted for each sex. The models presented variance explained of 54% and 49% for women and men, respectively. In both sexes, the students' perceived health competence and academic variables contributed significantly to their quality of life, and age, BMI, and medication and supplement use were significant factors relating to how a student views his or her body image. Women's quality of life was associated with body shape concern and emotional eating aspects. Men's quality of life was associated with general body appearance and cognitive restriction aspects. These results can be used to create and implement educational programs to improve quality of life of university students.
- Impact of sociodemographic characteristics, nutritional status and perceived stress in body weight concern of female college studentsPublication . Dias, Juliana Chioda Ribeiro; Silva, Wanderson Roberto da; Maroco, João; Campos, Juliana Alvares Duarte BoniniAim: to estimate the contribution of nutritional status, perceived stress and sociodemographic variables in college students’ body weight concern. Method: participated 850 Brazilian students of one public university. Information such as age, area of study and schedule of the undergraduate course, body weight and height, economic status, household’s education level, household, studies funding and medication intake due to studies and labour activity were collected. Perceived stress and body weight concern were assessed, respectively, with the Portuguese versions of the Perceived Stress Scale (PSS) and the Weight Concerns Scale (WCS). The impact of several variables on body weight concern was verified by a causal model developed using Structural Equation Modelling. The goodness-of-fit of the model was evaluated using chi-square ratio index and degrees of freedom (c2/df), Comparative Fit Index (CFI), Normed of Fit Index (NFI), and Root Mean Square Error of Approximation (RMSEA). The contribution (β) and significance of causal pathways were evaluated using the z-test critical ratios (p < .05). Results: a significant contribution of the variables perceived stress, economic status and nutritional status in college students’ body weight concern was verified. The fit of the final model was adequate (c²/df = 4.38; CFI = .91; GFI = .93; RMSEA = .06) and explained 19% of the variability in body weight concern with a positive impact of nutritional status, perceived stress and economic status. Conclusion: the results should serve as an alert to researchers in this area of study and health professionals, highlighting the importance of performing the diagnosis of such manifestations and/or propose prevention strategies.
- Investigating method effects associated with the wording direction of items of the Social Physique Anxiety ScalePublication . Silva, Wanderson Roberto da; Soler Donofre, Giovanna; Neves, Angela; Maroco, J. P.; Teixeira, Patrícia Angélica; Alvares Duarte Bonini Campos, JulianaPurpose The use of psychometric instruments to measure latent concepts is common. The development of these instruments usually involves mechanisms to reduce response bias, such as the inclusion of reversed items. The aim of this study was to investigate method efects related to the wording direction of the Social Physique Anxiety Scale (SPAS) items, a onedimensional instrument that assesses individual’s level of anxiety when others observe their body. Methods In total, 152 Brazilian adults (65.8% female) answered 2 formats of the SPAS: the original with 12 items (7 regular and 5 reversed); and a new format with all items written in the same direction (i.e., regular). Both formats were flled out at diferent times and alternately. Diferential item functioning analysis (DIF) and confrmatory factor analysis were conducted. Results The original SPAS did not ft the data, but after allowing covariances between all reversed items, the ft improved. The wording efect was supported by the DIF, indicating a better ft to the data for the new format with all items worded in the same direction. Conclusion The wording of the SPAS items had efect on the psychometric properties of instrument. When the wording of the reversed items was modifed, the factor model ftted the data. Future studies should take these fndings into account and evaluate the SPAS with all items worded in the same direction in diferent contexts. Level of evidence Descriptive (cross-sectional) study, Level V.
- Male body dissatisfaction scale (MBDS): Proposal for a reduced modelPublication . Silva, Wanderson Roberto da; Maroco, João; Ochner, Christopher N.; Campos, Juliana Alvares Duarte BoniniAims To evaluate the psychometric properties of the male body dissatisfaction scale (MBDS) in Brazilian and Portuguese university students; to present a reduced model of the scale; to compare two methods of computing global scores for participants’ body dissatisfaction; and to estimate the prevalence of participants’ body dissatisfaction. Methods A total of 932 male students participated in this study. A confirmatory factor analysis (CFA) was used to assess the scale’s psychometric properties. Multi-group analysis was used to test transnational invariance and invariance in independent samples. The body dissatisfaction score was calculated using two methods (mean and matrix of weights in the CFA), which were compared. Finally, individuals were classified according to level of body dissatisfaction, using the best method. Results The MBDS model did not show adequate fit for the sample and was, therefore, refined. Thirteen items were excluded and two factors were combined. A reduced model of 12 items and 2 factors was proposed and shown to have adequate psychometric properties. There was a significant difference (p\0.001) between the methods for calculating the score for body dissatisfaction, since the mean overestimated the scores. Among student participants, the prevalence of body dissatisfaction with musculature and general appearance was 11.2 and 5.3%, respectively. Conclusions The reduced bi-factorial model of the MBDS showed adequate validity, reliability, and transnational invariance and invariance in independent samples for Brazilian and Portuguese students. The new proposal for calculating the global score was able to more accurately show their body dissatisfaction. No level of evidence Basic Science
- Nutritional status discriminatory capacity of different methods of obtaining body mass indexPublication . Campos, Juliana Alvares Duarte Bonini; Santana, Moema de Souza; Santos, Adrielly dos; Silva, Wanderson Roberto daInexistente.
- Psychometric properties of the World Health Organization Quality of Life Instrument-Abbreviated version in Portuguese-speaking adults from three different countriesPublication . Silva, Wanderson Roberto da; Bonafé, Fernanda Salloumé Sampaio; Maroco, João; Maloa, Benvindo Felismino Samuel; Campos, Juliana Alvares Duarte BoniniTo evaluate the validity, reliability and invariance of the World Health Organization Quality of Life Instrument-Abbreviated version (WHOQOL-Bref) in Portuguese-speaking adults from three different countries.
- Validation of the Weight Concerns Scale applied to brazilian university studentsPublication . Dias, Juliana Chioda Ribeiro; Silva, Wanderson Roberto da; Maroco, João; Campos, Juliana Alvares Duarte BoniniThe aim of this study was to evaluate the validity and reliability of the Portuguese version of the Weight Concerns Scale (WCS) when applied to Brazilian university students. The scale was completed by 1084 university students from Brazilian public education institutions. A confirmatory factor analysis was conducted. The stability of the model in independent samples was assessed through multigroup analysis, and the invariance was estimated. Convergent, concurrent, divergent, and criterion validities as well as internal consistency were estimated. Results indicated that the one-factor model presented an adequate fit to the sample and values of convergent validity. The concurrent validity with the Body Shape Questionnaire and divergent validity with the Maslach Burnout Inventory for Students were adequate. Internal consistency was adequate, and the factorial structure was invariant in independent subsamples. The results present a simple and short instrument capable of precisely and accurately assessing concerns with weight among Brazilian university students.