For this purpose, age was categorized as ≤18 and ≥19 years old to attain similar number of athletes per group, and respect the DRI agedgroup cut-offs. Moreover, regarding the statistical significance differences between users and nonusers by gender for sport and hours of training (Table 1), these variables were also included as confounders. All statistical procedures were completed using the SPSS version 20 software (SPSS Inc., Chicago, IL, USA). The level of significance was set at p < 0.05.