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EnglishA psychometric analysis of a Portuguese version of the Multidimensional Anxiety Scale for Children (MASC) was undertaken in a school-based sample of 2041 Portuguese adolescents aged 12-18 years. A confirmatory factor analysis did not support the original four-factor structure (March, Parker, Sullivan, Stallings, & Conners, 1997). Therefore a confirmatory factor analysis with a 3rd order model was conducted (with subfactors, factors, and total score) revealing better adjustment indexes. The difference between models was also significant. After a multigroup analysis, this structure revealed to be invariant across gender, but only configural and metric invariance was found across age groups. The convergent and divergent validity of the MASC was confirmed using measures of anxiety, depression, and general well-being. A moderate to high temporal stability, in a three-week interval, was obtained. This study confirmed that the Portuguese edition of the MASC is a reliable and useful self-report instrument to assess anxiety in adolescents. portuguesFoi realizado um estudo psicometrico da versao Portuguesa da Escala Multidimensional de Ansiedade para Criancas (MASC), utilizando uma amostra de 2.041 adolescentes, entre os 12 e os 18, recolhida em contexto escolar. Uma vez que a analise fatorial confirmatoria nao replicou a estrutura original de quatro fatores (March, Parker, Sullivan, Stallings, & Conners, 1997), foi levada a cabo uma analise fatorial confirmatoria, com um fator de 3a ordem (com subfatores, fatores e total), que revelou melhores indices de ajustamento, sendo a diferenca entre os modelos estatisticamente significativa. Apos realizacao de uma analise multigrupos, esta estrutura revelou-se invariante para o genero, enquanto que apenas foi encontrada invariância configural e metrica para a idade. A validade convergente e divergente foi confirmada, usando medidas de ansiedade, bem-estar e depressao. Verificou-se uma estabilidade moderada a elevada, relativa a um intervalo de 3 semanas. Este estudo confirmou que a versao Portuguesa da MASC e um instrumento de autorresposta fidedigno e util para avaliar ansiedade em adolescentes.

revista iberoamerica de diagnóstico y evaluación psicológica

A Escala Multidimensional de Ansiedade para Crianças (MASC): Propriedades psicométricas e análise fatorial confirmatória numa amostra de adolescentes portugueses