Table 4.
Relationship of BMD and variables measured (univariate regression analyses and multiple regression models constructed by backward stepwise).
| AP spine BMD | Femoral neck BMD | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Variables | Univariate | Multivariate | Univariate | Multivariate | ||||||||
| Regres. coeff. (95% CI) |
P | R 2 | Regres.coeff. (95% CI) |
P | R 2 | Regres. coeff. (95% CI) |
P | R 2 | Regres. coeff. (95% CI) |
P | R 2 | |
| Age (yrs)# | 0.29 (−0.81; 1.39) |
ns | 1.24 (0.28; 2.19) |
0.01 | 9% | |||||||
| Disease duration (yrs)° | −0.01 (−0.02; −0.00) |
0.03 | 7% | −0.01 (−0.02; −0.00) |
0.01 | 10% | ||||||
| Duration of amenorrhea (months)* |
−0.03 (−0.06; −0.01) |
0.01 | 10% | −0.03 (−0.05; −0.01) |
0.01 | −0.03 (−0.05; −0.00) |
0.02 | 8% | ||||
| BMI (Kg/m2) | 0.02 (0.00; 0.03) |
0.02 | 9% | 0.01 (−0.01; 0.02) |
ns | |||||||
| IGF-I (µg/mL)° | 0.01 (0.00; 0.02) |
0.01 | 11% | 0.02 (0.01; 0.02) |
0.001 | 22% | 0.01 (0.01; 0.02) | 0.001 | ||||
| IGFBP-3 (mg/mL) | 0.01 (−0.01; 0.04) |
ns | 0.03 (0.00; 0.05) |
0.02 | 16% | |||||||
| Parathyroid hormone# | 0.11 (−0.14; 0.35) |
ns | 0.19 (−0.05; 0.44) |
ns | ||||||||
| 25 OH-Vitamin D (nmol/l)° | 0.00 (−0.01; 0.02) |
ns | −0.001 (−0.01; 0.01) |
ns | ||||||||
| Physical activity (h/week)° | 0.03 (−0.00; 0.06) |
ns | 0.01 (−0.02; 0.04) |
ns | ||||||||
| Protein intake (g/kg of body weight × d)° |
−0.07 (−0.16; 0.01) |
ns | −0.04 (−0.11; 0.04) |
ns | ||||||||
| Calcium intake (mg/d)* | −0.04 (−0.10; 0.02) |
ns | −0.02 (−0.07; 0.03) |
ns | ||||||||
| 21% | 29% | |||||||||||
#Reciprocal root variable (1/square root).
°Square root transformed variable.
*Log transformed variable.