Table 3.
Regional BMD variability (stepwise regression modeling)
| BMD Region | Variable | Variability explained by model
(r2) |
Cumulative variability explained by model
(Cumulative r2) |
F ratio | p value |
|---|---|---|---|---|---|
| PA Spine | |||||
| PYY | 59.3% | 59.3% | 1.8 | 0.003 | |
| Fat-free mass | 7.5% | 66.8% | 1.6 | 0.19 | |
| Duration of AN | 0.2% | 67.0% | 0.04 | 0.84 | |
| Lateral Spine | |||||
| PYY | 67.1% | 67.1% | 5.8 | 0.002 | |
| Age | 4.8% | 71.9% | 0.5 | 0.27 | |
| Duration of AN | 0.02 | 72.1% | 0.04 | 0.85 | |
| Total Hip | |||||
| Duration of AN | 56.5% | 56.5% | 1.2 | 0.005 | |
| PYY | 8.0% | 64.5% | 1.8 | 0.19 | |
| Age | 0.01% | 64.6% | 0.006 | 0.94 | |
| Femoral Neck | |||||
| Fat-free mass | 67.0% | 67.0% | 4.7 | 0.001 | |
| PYY | 3.7% | 70.7% | 0.5 | 0.31 | |
| Duration of AN | 0.5% | 71.2% | 0.1 | 0.73 | |
| Total Radius | |||||
| BMI | 74.4% | 74.4% | 10.4 | 0.0003 | |
| PYY | 4.7% | 79.1% | 1.2 | 0.19 | |
| Duration of AN | 0% | 79.1% | 0.001 | 0.98 | |
| 1/3 Distal Radius | |||||
| Fat-free mass | 74.0% | 74.0% | 10.4 | 0.0003 | |
| PYY | 7.7% | 81.7% | 5.8 | 0.08 | |
| Duration of AN | 3.3% | 85.0% | 1.8 | 0.22 | |
| PA Spine BMAD | |||||
| PYY | 60.9% | 60.9% | 1.8 | 0.003 | |
| BMI | 5.6% | 66.5% | 1.2 | 0.25 | |
| Duration of AN | 2.2% | 68.7% | 0.6 | 0.47 | |
| Femoral Neck BMAD | |||||
| Duration of AN | 46.9% | 46.9% | 0.2 | 0.01 | |
| Age | 5.8% | 52.7% | 1.2 | 0.32 | |
| PYY | 4.9% | 57.6% | 0.9 | 0.36 | |
AN, anorexia nervosa; BMI, body mass index