Table 3 |
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|
Demographic and disease-related variables showing significant correlation with BMD at different measurement sites. |
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|
Variables |
AP lumbar aBMD |
Lateral lumbar aBMD |
Lumbar vBMD |
Hip total aBMD |
Femoral neck aBMD |
Radius total aBMD |
|
|
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|
Demographic |
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|
Sex |
0.337 P < 0.001 |
0.294 P < 0.001 |
n.s. |
0.380 P < 0.001 |
0.228 P = 0.001 |
0.677 P < 0.001 |
|
Age |
n.s. |
-0.282 P < 0.001 |
-0.413 P < 0.001 |
-0.222 P = 0.001 |
-0.322 P < 0.001 |
-0.328 P < 0.001 |
|
Menopause |
-0.394 P < 0.001 |
-0.385 P < 0.001 |
-0.190 P = 0.007 |
-0.378 P < 0.001 |
-0.322 P < 0.001 |
-0.570 P < 0.001 |
|
Heredity for fractures |
n.s. |
n.s. |
n.s. |
-0.249 P < 0.001 |
-0.276 P < 0.001 |
-0.148 P = 0.035 |
|
BMI |
0.273 P < 0.001 |
n.s. |
n.s. |
0.342 P < 0.001 |
0.255 P < 0.001 |
0.177 P = 0.012 |
|
PAHWI total |
n.s. |
0.179 P = 0.011 |
0.253 P < 0.001 |
n.s. |
n.s. |
0.178 P = 0.012 |
|
Disease-related variables |
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|
Years since symptom debut |
-0.180 P = 0.011 |
-0.335 P < 0.001 |
-0.429 P < 0.001 |
-0.315 P < 0.001 |
-0.376 P < 0.001 |
-0.270 P < 0.001 |
|
Years since diagnosis |
-0.146 P = 0.039 |
-0.286 P < 0.001 |
-0.396 P < 0.001 |
-0.221 P = 0.002 |
-0.319 P < 0.001 |
n.s. |
|
BASMI |
n.s. |
-0.260 P < 0.001 |
-0.405 P < 0.001 |
-0.257 P < 0.001 |
-0.379 P < 0.001 |
-0.195 P = 0.006 |
|
mSASSS |
n.s. |
n.s. |
-0.386 P < 0.001 |
n.s. |
-0.187 P = 0.008 |
n.s. |
|
Coxitis, yes/no |
-0.158 P = 0.025 |
-0.143 P = 0.042 |
n.s. |
-0.189 P = 0.007 |
-0.161 P = 0.022 |
n.s. |
|
Mean ESR 2004 to 2008 |
-0.172 P = 0.015 |
n.s. |
n.s. |
-0.168 P = 0.017 |
-0.155 P = 0.028 |
-0.222 P = 0.002 |
|
Lifetime prednisone use |
n.s. |
-0.241 P = 0.001 |
-0.236 P = 0.001 |
-0.222 P = 0.001 |
-0.269 P < 0.001 |
-0.316 P < 0.001 |
|
ESR |
-0.162 P = 0.021 |
-0.221 P = 0.002 |
n.s. |
-0.170 P = 0.016 |
n.s. |
-0.285 P < 0.001 |
|
CRP |
n.s. |
n.s. |
-0.163 P = 0.021 |
n.s. |
n.s. |
n.s. |
|
Hemoglobin |
0.261 P < 0.001 |
0.225 P = 0.001 |
n.s. |
0.285 P < 0.001 |
0.179 P < 0.011 |
0.466 P < 0.001 |
|
WBC |
-0.159 P = 0.024 |
-0.171 P = 0.015 |
n.s. |
-0.146 P = 0.038 |
n.s. |
n.s. |
|
PLT |
-0.197 P = 0.005 |
-0.155 P = 0.028 |
n.s. |
n.s. |
n.s. |
n.s. |
|
|
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|
Results are presented as Spearman's correlation coefficients and P-values. Coding for categorical variables, 1 = yes, 0 = no; for sex, 1 = woman, 2 = man. BMI, body mass index; PAHWI, Physical Activity at Home and Work Instrument; BASMI, Bath Ankylosing Spondylitis Metrology Index; mSASSS, modified Stoke Ankylosing Spondylitis Spine Score; ESR, erythrocyte sedimentation rate; CRP, C-reactive protein; WBC, white blood cell count; PLT, platelet count; AP, anteroposterior; aBMD, areal bone mineral density; vBMD, volumetric BMD; n.s., not significant. |
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|
Klingberg et al. Arthritis Research & Therapy 2012 14:R108 doi:10.1186/ar3833 |
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