*2.3. Procedures*

Participant information and the link to an online questionnaire were sent to coaches. The coaches were contacted and identified by the members of the research team. The coaches were asked to send the questionnaire to the parents and/or legal guardians of the athletes who met the inclusion criteria of this study by email. The parents and/or legal guardians of the athletes completed and submitted the questionnaire online. All responses were anonymous. The survey was available online from June 2019 to June 2020.

#### *2.4. Data Analyses*

The criterion variable, non-contact lower-limb injury, was analyzed as a categorical variable (presence or absence of injury). The presence of injury was defined as a positive response to the question: "During the preceding 12 months, did you suffer any noncontact lower-limb injury causing time loss for at least one day from participation in sport activities?" The predictor variables were age (y), sex (female vs. male), leg preference (left vs. right leg), sport category (laterally dominant vs. non-laterally dominant sport), length of training (y), training frequency (sessions/wk), and training intensity (low, moderate, high). The continuous measurements (age and length of training) were described as mean ± standard deviation. The other measurements were described with frequencies and percentages.
