Table 4 |
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|
Results from multiple linear regression analyses with BMD at different measuring sites as the outcome. |
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|
AP lumbar aBMD |
Lateral lumbar aBMD |
Lumbar vBMD |
Total hip aBMD |
Femoral neck aBMD |
Total radius aBMD |
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|
|
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|
Constant all variables |
0.829 |
0.539 |
0.2390 |
0.783 |
0.654 |
0.625 |
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|
R2 all variables |
0.290 |
0.245 |
0.266 |
0.402 |
0.343 |
0.591 |
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|
R2 for demographic variables |
0.254 |
0.163 |
0.171 |
0.338 |
0.279 |
0.569 |
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|
R2 for disease related variables |
0.079 |
0.181 |
0.276 |
0.174 |
0.198 |
0.253 |
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|
|
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|
Demographic variables |
B |
P-value |
B |
P-value |
B |
P-value |
B |
P-value |
B |
P-value |
B |
P-value |
|
|
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|
Sex |
NA |
NA |
NA |
-0.056 |
0.009 |
NA |
-0.082 |
< 0.001 |
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|
Age, years |
NA |
NA |
NA |
NA |
NA |
-0.001 |
0.002 |
|||||
|
Menopause |
-0.156 |
< 0.001 |
-0.104 |
< 0.001 |
NA |
-0.053 |
0.048 |
-0.076 |
< 0.001 |
-0.035 |
0.009 |
|
|
BMI, kg/m2 |
0.014 |
< 0.001 |
NA |
NA |
0.014 |
< 0.001 |
0.011 |
< 0.001 |
0.004 |
< 0.001 |
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|
|
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|
Disease-related variables |
B |
P -value |
B |
P -value |
B |
P -value |
B |
P -value |
B |
P -value |
B |
P -value |
|
|
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|
Years since diagnosis |
NA |
-0.003 |
< 0.001 |
NA |
NA |
NA |
NA |
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|
Years since symptom debut |
NA |
NA |
-0.001 |
< 0.001 |
-0.002 |
0.019 |
-0.002 |
0.028 |
NA |
|||
|
BASMI |
NA |
NA |
-0.006 |
< 0.001 |
-0.023 |
< 0.001 |
-0.029 |
< 0.001 |
-0.008 |
0.016 |
||
|
Hemoglobin |
NA |
0.002 |
0.008 |
NA |
NA |
NA |
NA |
|||||
|
WBC |
NA |
NA |
NA |
-0.007 |
0.05 |
NA |
NA |
|||||
|
PLT |
0.000 |
0.003 |
NA |
NA |
NA |
NA |
NA |
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|
|
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|
All demographic and disease-related variables that were significantly correlated with BMD in the first analyses were entered as covariates. The table shows only covariates that remained significantly associated with BMD in the stepwise multiple linear regression models. Coding for categorical variables, 1 = yes, 0 = no; for sex, 1 = woman, 2 = man. Beta values are unstandardized regression coefficients. AP, anteroposterior; BASMI, Bath Ankylosing Spondylitis Metrology Index; aBMD, areal bone mineral density; vBMD, volumetric BMD; BMI, body mass index; mSASSS, modified Stoke Ankylosing Spondylitis Spine Score; PLT, platelet count; WBC, white blood cell count. |
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|
Klingberg et al. Arthritis Research & Therapy 2012 14:R108 doi:10.1186/ar3833 |
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