Objectives: translation, retroversion, cultural adaptation and validation of Autism Screening Questionnaire or Social Communication Questinnaire, Lifetime version to Portuguese language for its use in Brasil.
Methods: a sample of 120 patients was divided in three distinct groups of 40 individuals each: PDD clinical diagnosis, Down syndrome and psychiatric diagnosis. The questionnaire was applied to the persons legally responsible for the patients according to the standards of a self-applicable questionnaire. Psychometric measures of the translated questionnaire in his final version were tested.
Results: Sensibility values of 92.9% and specificity of 95.5% were found, considering a cutoff point of 15 points. The internal validity for the total 40 questions was 0.895, with a variation of 0.6 to 0.8. The reliability values obtained from the test and re-test demonstrated high agreement for most of the questions.
Conclusions: The final version of the instrument translated and adapted to the Brazilian culture, presented fully satisfactory measurement properties, proving to be of easy application and a useful tool for the diagnostic screening of PDD individuals.