Table 3.
Prediction model for dropout (Cox regressions with proportional hazard ratios) after using STEP algorithm among set of variables separately for physical fitness variables alone, body composition variables alone, hormonal variables alone and psychological factors alone.
| Characteristics | Beta-Coefficients + 95% CI | p-Value |
|---|---|---|
| Physical fitness | ||
| 12 min running test (m) | 0.998 (0.996–1.00002) | 0.052 |
| Maximal isometric force of the lower extremities (kN) | 0.0996 (0.0991–0.1001) | 0.129 |
| Body composition | ||
| Body height (cm) | 0.08 (−0.04–0.21) | 0.226 |
| % Body fat | 0.04 (−0.07–0.16) | 0.435 |
| Skeletal muscle mass (kg) | −0.14 (−0.33–0.02) | 0.103 |
| Hormonal factors | ||
| Cortisol (nmol/L) | 1.006 (1.0003–1.01) | 0.039 |
| IGF-1 (nmol/L) | 1.09 (0.98–1.21) | 0.096 |
| Psychological factors | ||
| Hardiness | 0.29 (0.06–1.30) | 0.105 |
| Depression | 0.10 (0.009–1.17) | 0.066 |
| Stress | 2.95 (0.65–13.32) | 0.159 |
All regressions adjusted for treatment condition beginning at day 6 of the military field training for treatment group.