Table 2: Partial Correlation analysis.

Control variablesTIMP-1MMP-9MMP-13TNF-αNO

Material
 TIMP-1
  Correlation1.00−0.14−0.380.33−0.26
  Significance (2-tailed)0.080.0000.0000.001
 MMP-9
  Correlation−0.141,0−0.040.340.46
  Significance (2-tailed)0.080.610.0000.000
 MMP-13
  Correlation−0.38−0.041.0000.130.01
  Significance (2-tailed)0.0000.610.090.88
 TNF-α
  Correlation0.330.340.131.000−0.04
  Significance (2-tailed)0.0000.0000.090.59
 NO
  Correlation−0.260.460.01−0.041.000
  Significance (2-tailed)0.0010.0000.880.59