Social anxiety: adaptation and evidence of validity of the short form of the Social Interaction Anxiety Scale and Social Phobia Scale for Brazil

ABSTRACT Objective Social anxiety is a poorly publicized psychological disorder, but with an important epidemiological distribution. The present study aimed to adapt the reduced versions of the Social Interaction Anxiety Scale (SIAS) and Social Phobia Scale (SPS) (SIAS-6 and SPS-6) to the Brazilian context and produce evidence of validity. These scales assess anxiety in social interactions and social anxiety in face of the possibility of scrutiny by other people, being complementary. Methods As they are scales with recognized international use, adaptation to Brazil can bring contributions to clinical and scientific investigations about Social Anxiety Disorder. Judicious processes for adaptation were carried out (translation, evaluation by judges, back-translation, evaluation by the target audience) and an online survey was conducted with 1,049 people, over 18 years of age with an average age of 25.98 years (SD = 7.55). Results Confirmatory Factor Analysis was used and, thus, it was found that the adjustment indexes produced are, generally, adequate (SRMR < 0.04, CFI > 0.96, TLI > 0.94 and RMSEA < 0.05) and that the items have adequate factor loads. Evidence of discriminant validity was also satisfactory, managing to differentiate groups by income and sexual orientation as expected by the literature. Conclusions The results suggest that the scales are suitable for use in Brazil, both for separate use and for combined use, as correlated factors.