Figure 2.

Percentage of low bone mineral density (BMD z score <−1.0) by sport-specialization level among female high school distance runners (low sport specialization = distance running [cross-country (XC), track and field (TF), both] ≤8 mo/y competitive sport participation or training and 1 or more other sport[s] played; moderate sport specialization = distance running [XC, TF, both] only ≤8 mo/y competitive sport participation or training or distance running [XC, TF, both] ≥9 mo/y competitive sport participation or training and 1 or more other sport[s] played; high sport specialization = distance running only [XC, TF, both] for ≥9 mo/y competitive sport participation or training).