Table 3

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

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.


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.

Klingberg et al. Arthritis Research & Therapy 2012 14:R108   doi:10.1186/ar3833

Open Data