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Table 4 Correlation coefficients of the some clinical and laboratory data

From: Biomarkers and cytokines of bone turnover: extensive evaluation in a cohort of patients with ankylosing spondylitis

  Disease duration BASRI-h BASRI-s BMD-f BMD-l BASDAI ≥4 BASMI hsCRP OPG sRANKL Sclerostin DKK1 sFRP1
Disease duration   0.3 0.6   0.3   0.6    −0.3 0.3   
BASRI-h 0.3   0.6    −0.3 0.5 0.4      
BASRI-s 0.6 0.6    0.3   0.7 0.3   −0.4    
BMD-f      0.3         
BMD-l 0.3   0.3 0.3    0.4     0.2   
BASDAI ≥ 4   −0.3        0.3     
BASMI 0.6 0.5 0.7   0.4      −0.4   0.3  
hsCRP   0.4 0.3           
OPG       0.3        
sRANKL −0.3   −0.4     −0.4       −0.2
Sclerostin 0.3     0.2        0.2  
DKK1        0.3     0.2   −0.2
sFRP1             −0.2  
  1. Values indicate correlation coefficients. Note that empthy cells indicate no significance between variables. BASRI-h, and BASRI-s= Bath ankylosing spondylitis radiology index hip, and spine respectively, BMD-f, and BMD-l= BMD femoral neck and lumbar spine respectively, BASFI= Bath ankylosing apondylitis functional index, BASDAI= Bath ankylosing spondylitis disease activity index, BASMI= Bath ankylosing spondylitis metrology index, sRANKL= soluble receptor activator of nuclear factor kappa-B ligand, OPG= osteoprotegerin, sFRP1= secreted frizzled-related protein 1, DKK1= Dickkopf-related protein 1.