Univariate binary logistic analysis of factors for low BMD for all participants (cyclists, n=19; runners, n=21)
| Factor | OR | 95% CI | P value |
| Age (year) | 1.068 | (0.907 to 1.257) | 0.429 |
| Height (cm) | 0.985 | (0.917 to 1.058) | 0.683 |
| Body mass (kg) | 0.998 | (0.932 to 1.069) | 0.956 |
| BMI (kg/m2) | 1.124 | (0.740 to 1.706) | 0.583 |
| FFM (%) | 1.166 | (0.984 to 1.381) | 0.077 |
| FM (%) | 0.903 | (0.767 to 1.064) | 0.223 |
| Started competing (age)† | 1.020 | (0.876 to 1.188 | 0.795 |
| Years competing† | 0.940 | (0.745 to 1.186) | 0.603 |
| Training hours (year)† | 1.006 | (1.001 to 1.011) | 0.011* |
| Ca (mg/day)† | 0.999 | (0.998 to 1.000) | 0.205 |
| Number of athletes training HRT last 2 years | 0.134 | (0.015 to 1.212) | 0.074 |
| Incident‡ total career acute fractures (%)† | 7.000 | (1.413 to 34.682) | 0.017* |
| Incident‡ total career stress fractures (%)† | – | – | – |
*P≤0.05;
†Missing data form two participants.
‡Cumulative incidence.
BMD, bone mineral density; BMI, body mass index; Ca, calcium; FFM, fat-free mass; FM, fat mass; HRT, heavy resistance training.