Table 2.
Linear regression analysis of covariates associated with increased dual-energy x-ray absorptiometry (DXA) Z-scores on subset of sample with duration of illness > 9 months and BMI < 16
| β (95% CI) | p | ||
|---|---|---|---|
| Whole body BMC Z-score | Female (vs. male) | −0.02 (−0.47, 0.43) | 0.44 |
| Age | 0.07 (0.01, 0.13) | 0.04 | |
| %mBMIa | 0.03 (0.02, 0.04) | <0.0001 | |
| Duration of illnessb | −0.13 (−0.28, 0.02) | 0.09 | |
| Lumbar spine BMD Z-score | Female (vs. male) | −0.26 (−0.87, 0.35) | 0.41 |
| Age | −0.08 (−0.16, 0.00) | 0.05 | |
| %mBMIa | 0.03 (0.01, 0.05) | <0.001 | |
| Duration of illnessb | −0.13 (−0.32, 0.06) | 0.19 | |
| Total hip BMD Z-score | Female (vs. male) | −0.22 (−0.76, 0.32) | 0.43 |
| Age | 0.06 (−0.01, 0.13) | 0.11 | |
| %mBMIa | 0.03 (−0.36, −0.02) | <0.001 | |
| Duration of illnessb | −0.19 (−0.36, −0.02) | 0.03 | |
| Femoral neck BMD Z-score | Female (vs. male) | −0.42 (−0.91, 0.07) | 0.1 |
| Age | 0.03 (−0.05, 0.11) | 0.39 | |
| %mBMIa | 0.02 (0.01, 0.03) | 0.0009 | |
| Duration of illnessb | −0.08 (−0.26. 0.10) | 0.39 |
a
%mBMI = percentage median body mass index
b
Duration has been log-transformed due to the skewness of the original data