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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.
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Arthritis Research & Therapy

ISSN: 1478-6362

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