Background: In Brazil, social policies are paying particular attention to sport by mobilizing different sectors of society, and by focusing on participation of the young people in the
sport. Currently, Brazil has one of the broadest and sustainable programs in the world. In this context, with particular characteristics, due to geographical and socio-cultural dimensions, there has
been no systematic study that has combined perception variables on the experiences of underserved youth in sport, time of participation and Human Development Index of Municipalities (HDIM). The aim of
this study was to observe the strength of the interaction between the positive experience of underserved youth in sport and perceived self-efficacy by controlling time of participation and HDIM.
Methods: Youth (n=821) with mean age of 13.2±1.5, who are attending extracurricular sports program, participated in the study. Data were obtained through the Youth Experience in Sport
questionnaire (YES-S) and General Self-Efficacy Scale, demographic information (age, sex and time of participation in the program) and HDIM. Descriptive statistics were applied to all values obtained
and multilevel modeling was used to explore the influence of independent variables.
Results: The results show a positive and significant influence of perceived self-efficacy on the positive experience of the underserved youth in sport, enhanced by the time of
participation in the program. The exponents were positive, indicating that the trend of positive experience in sports can positively influence the perceived self-efficacy. The underserved youth in
contexts, with high HDIM, remained longer in the program, which is contradictory in relation to the goals of the program.
Conclusions: The study brings innovative and decisive contributions to the understanding and evaluation of the youth participation in sport. The time of participation in the program
and IDHM are essential variables that can be used in explaining the developmental experience provided by the sport participation.