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Table 4 Correlations of cathepsin K with clinical, laboratory and radiological parameters

From: Serum cathepsin K levels of patients with longstanding rheumatoid arthritis: correlation with radiological destruction

  Mean Standard deviation n Coeffficient Probability > |r|
Variable 1      
   Cathepsin K 304.66 677.607    
Variable 2      
   Age (years) 62.89 11.1581 100 0.0543 0.5915
   Rheumatoid factor (U/l) 298.818 1136.49 100 0.4761 < 0.0001
   Morning stiffness (min) 32 38.7233 100 0.1320 0.1905
   Erythrocyte sedimentation rate (mm/hour) 30.27 20.8404 100 0.2200 0.0279
   C-reactive protein (mg/l) 24.96 23.5032 100 0.1121 0.2670
   Ritchie score 11.31 10.3394 100 0.1353 0.1797
   Proximal interphalangeal score 1.51 2.69865 100 0.2560 0.0101
   Disease activity score 3.33283 1.43345 100 0.2093 0.0376
   Larsen score 54.77 49.3335 100 0.2856 0.0040