Table 1. Mean (SD) demographic characteristics of participants.
Age, years 15.6 (.5)
Time from peak height velocity, year +3.1 (.5)
Height, m 1.64 (.06)
Body mass [kg] 56.8 (5.8)
Fat mass [%] 17.3 (3.7)
Average soccer training volume, sessions per weeks 9.3 (.5)