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) Regres.coeff. (95% CI) Regres. coeff. (95% CI) Regres. coeff.(95% CI) 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 bodyweight × 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.