Figure 1
Correlation coefficient (r) and significance of simple linear regression between bone mineral density (BMD) in spine and age, anthropometric, and reproductive factors_
| Independent variable | r | P |
|---|---|---|
| Age | -0.22 | 0.004 P < 0.01 = very significant, |
| Age at menarche | -0.27 | 0.0003 P < 0.001 = very significant, |
| Age at menopause | -0.02 | 0.715 |
| Reproductive period | 0.05 | 0.506 |
| Number of years after menopause | -0.19 | 0.0093 P < 0.01 = very significant, |
| Weight | 0.42 | <0.0001 P < 0.001 = very significant, |
| Body mass index | 0.31 | <0.0001 P < 0.001 = very significant, |
| Stature | 0.26 | 0.0004 P < 0.001 = very significant, |
Patient characteristics
| Variable | Min. | Max. | Mean ± SD |
|---|---|---|---|
| Age | 33 | 70 | 57.8 ± 7.6 |
| Age at menarche (y) | 10 | 19 | 13.9 ± 1.7 |
| Age at menopause (y) | 22 | 58 | 45.3 ± 5.8 |
| Reproductive period (y) | 5 | 44 | 31.4 ± 6.0 |
| Number of years after menopause (y) | 1 | 34 | 12.5 ± 12.5 |
| Stature (m) | 1.40 | 1.75 | 1.6 ± 0.1 |
| Weight (kg) | 36 | 98 | 63.7 ± 11.5 |
| BMI (kg/m2) | 14.8 | 38.4 | 25.5 ± 4.5 |
| Bone mineral density in spine (g/cm2) | 0.24 | 0.77 | 0.68 ± 0.08 |