The objective of the present study was the psychometric evaluation of the Tripartite Influence Scale (TIS) among Brazilian youths of both sexes. The sample consisted of 475 undergraduate students aged between 18 and 29 years old (M = 20.8, SD = 2.0). We evaluated the construct validity (exploratory factor analysis), convergent validity (correlation between the scores of the TIS and measures of body satisfaction), reliability (Cronbach's alpha) and reproducibility (test-retest). The instrument presented factorial structure composed of three factors replicating the original scale factors, significant negative correlation for measures of body satisfaction (> -.21, p <.001), and showed no difference between the scores on test-retest reproducibility. It was confirmed TIS's psychometric properties, and its use is indicated for young Brazilian people.
Psychometrics; body image; eating disorders; scales; test validity
