Validade e Confiabilidade da Versão Portuguesa da Brief Motor Scale em Pessoas com Esquizofrenia: Um Estudo Preliminar

Abstract

Introdução: Os sinais neurológicos discretos (NNS) indicam uma disfunção cerebral não específica e têm sido documentados no curso clínico da esquizofrenia, sendo considerados como sintomas importantes para a monitorização da doença. A Brief Motor Scale (BMS) tem sido amplamente utilizada para avaliar os sinais neurológicos discretos em pessoas com esquizofrenia, mas a versão portuguesa continua indisponível. O objetivo deste estudo é a investigação da validade e confiabilidade da versão portuguesa Brief of Motor Scale (BMS_pt).
 Material e Métodos: As orientações internacionais para o processo de adaptação transcultural do instrumento foram consideradas. Participaram no estudo 43 adultos com esquizofrenia, entre os 23 e 63 anos (39,74±11,16), 38 homens e 5 mulheres.
 Resultados: Os índices de validade de conteúdo (>0,75) da BMS_pt demonstraram um acordo moderado/forte entre os especialistas. A consistência interna foi confirmada, com alfa de Cronbach variando de 0,82 a 0,87. As correlações de Pearson variaram entre 0,93 e 0,99 (p<0,01). A análise fatorial exploratória resultou num modelo de dois fatores que explicou 58,91% da variância total.
 Conclusão: Verificou‑se que todos os itens da BMS_pt são relevantes. A BMS_pt parece ser um instrumento válido e fiável para avaliar os sinais neurológicos motores discretos em pessoas com esquizofrenia, e com potencial para ser utilizado em serviços de reabilitação.

Assessing Motor Neurological Soft Signs in Schizophrenia: Confirmatory Factor Analysis of Portuguese Version of BMS-P

“…Validation of assessment instruments using statistical measures that are considered robust from an international scientific perspective is essential and crucial to its use for correct, valid, and scientifically based therapeutic purposes. In Portugal, the BMS-P was translated, adapted, and validated to Portuguese persons with schizophrenia, with content validity values >.75, reliability between .82 and .87, and Pearson correlations between scale items between .93 and .99, for p<.01 (Guimarães et al 2017(Guimarães et al , 2020, indicating that can be a reliable instrument to be used. However, a precise validation of the instrument and its theoretical construct is required.…”

“…Therefore, the aim of this study was to analyze the factor structure model of the Portuguese version of the Brief Motor, obtained through CFA. The BMS-P assumed the same model and organization (items and subscales) than the original version (Guimarães et al, 2017(Guimarães et al, , 2020. Based on previous EFA which pointed out two principal components that explain 58.91% of the scale variance, a model with two principal components but with different observed variables for each factor was hypothesized (Guimarães et al, 2020).…”

“…The BMS-P assumed the same model and organization (items and subscales) than the original version (Guimarães et al, 2017(Guimarães et al, , 2020. Based on previous EFA which pointed out two principal components that explain 58.91% of the scale variance, a model with two principal components but with different observed variables for each factor was hypothesized (Guimarães et al, 2020). This study aims to contribute, nationally and internationally, to the theoretical aspects of the assessment of MNSS in people with schizophrenia, and to bring evidence in the areas of psychomotricity that will contribute to a better and more effective psychomotor assessment and, consequently, to the validation of psychomotor intervention programs.…”

“…The Portuguese version of Brief Motor Scale (BMS-P) is the translated version of an instrument developed originally in Germany, which evaluates exclusively the MNSS of adults with schizophrenia spectrum disorders, in two dimensions: motor coordination (MOCO) and motor sequencing (MOSE) (Guimarães et al, 2018;Jahn et al, 2006a;Jahn et al, 2006b). Both versions, the original and the Portuguese, have been demonstrated to be a reliable instrument with identical psychometrics characteristics to other extensive versions (Guimarães et al, 2020;Jahn et al, 2006a;Jahn et al, 2006b, Zakaria et al, 2013. Each subscale consists of five items, with a maximal summary score for each subscale of 10 points (Guimarães et al, 2020).…”

“…Motor Neurological Soft Signs (MNSS) are the motor components of Neurological Soft Signs (NSS) and they have been increasingly studied in persons with Schizophrenia Spectrum, contributing to the knowledge of the psychomotor disorders (Afonso et al, 2021;Guimarães et al, 2017Guimarães et al, , 2018Guimarães et al, , 2020Janssens et al, 2017;Zakaria et al, 2013) that seems to precede and predict the onset of the disorder.…”