Table 2. BMD Z-scores and bone areas in the three study groups.
| Short BF | Intermediate BF | Prolonged BF | P | ||||||
| Whole group | n = 56 | SD | n = 48 | SD | n = 53 | SD | |||
| Z-score | LS | −0.06 | 1.03 | −0.20 | 1.02 | −0.38 | 1.02 | 0.29 | |
| FN | −0.01 | 0.89 | −0.09 | 0.89 | −0.24 | 0.88 | 0.41 | ||
| WB | 0.29 | 0.94 | 0.21 | 0.93 | 0.02 | 0.93 | 0.29 | ||
| Males | n = 26 | n = 21 | n = 29 | ||||||
| LS | Z-score | −0.08 | 1.00 | −0.44 | 0.98 | −0.67 | 1.00 | 0.12 | |
| Bone area (cm2) | 72.0 | 5.4 | 69.1 | 5.2 | 67.8 | 5.2 | 0.025 | ||
| FN | Z-score | 0.07 | 0.89 | 0.03 | 0.84 | −0.38 | 0.85 | 0.10 | |
| Bone area (cm2) | 5.9 | 0.5 | 5.8 | 0.4 | 5.8 | 0.4 | 0.74 | ||
| WB | Z-score | 0.22 | 0.95 | 0.08 | 0.89 | −0.35 | 0.91 | 0.049 | |
| Bone area (cm2) | 2354.4 | 127.6 | 2364.3 | 120.7 | 2314.7 | 122.3 | 0.30 | ||
| Females | n = 30 | n = 27 | n = 24 | ||||||
| LS | Z-score | 0.08 | 1.00 | 0.06 | 1.01 | −0.27 | 1.00 | 0.37 | |
| Bone area (cm2) | 59.5 | 326.7 | 60.0 | 311.5 | 60.6 | 297.0 | 0.81 | ||
| FN | Z-score | −0.04 | 0.91 | −0.14 | 0.92 | −0.17 | 0.92 | 0.86 | |
| Bone area (cm2) | 5.1 | 28.0 | 5.0 | 25.8 | 5.1 | 24.9 | 0.27 | ||
| WB | Z-score | 0.43 | 0.96 | 0.41 | 0.97 | 0.26 | 0.97 | 0.78 | |
| Bone area (cm2) | 2017.7 | 124.7 | 1998.1 | 126.8 | 2040.3 | 126.5 | 0.48 | ||
P values were analyzed with MANCOVA. For Z-scores the covariates used were gender (in the whole group), current weight, calcium intake, and physical activity at adolescence. For bone area the covariates were calcium intake, current weight and physical activity at adolescence. LS = lumbar spine; FN = femoral neck; WB = whole body; SD = standard deviation.