Statistical analysis was performed with the SPSS® software, version 13.0 IBM, and the categorical variables were expressed as percentages, and the continuous variables as means and standard deviations.
Fue realizada evaluación estadística con el programa SPSS versión 13.0 IBM, teniendo expresadas las variables categóricas en valores porcentuales y las continuas en medias y desvíos-estándar.
Foi realizada avaliação estatística com o programa SPSSversão 13.0 IBM, tendo expressas as variáveis categóricas em valores percentuais e as contínuas em médias e desviospadrão.