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Table 3 Demographic and disease-related variables showing significant correlation with BMD at different measurement sites.

From: Osteoporosis in ankylosing spondylitis - prevalence, risk factors and methods of assessment

Variables AP lumbar
aBMD
Lateral
lumbar
aBMD
Lumbar
vBMD
Hip total
aBMD
Femoral
neck
aBMD
Radius
total
aBMD
Demographic       
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
      
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.
  1. 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.
  2. 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.