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Table 3 Changes in matrix metalloproteinase-9 levels before and after eyelid debris debridement and meibomian gland expression in patients with moderate and severe meibomian gland dysfunction

From: Effects of lid debris debridement combined with meibomian gland expression on the ocular surface MMP-9 levels and clinical outcomes in moderate and severe meibomian gland dysfunction

Parameters Before treatment 4 weeks after the treatment P value
MMP-9 levelsa 2.58 (0.20) 1.92 (0.26) 0.029
MMP-9 positivityb 20 (83.3%) 12 (50.0%) 0.014
  1. MMP-9 matrix metalloproteinase-9
  2. MMP-9 levels were measured based upon the changes in the intensity of color on a scale of 0 to 4, as follows: 0, none; 1, trace; 2, weak positive; 3, positive; and 4, strong positive
  3. aResults are presented as mean (standard error) and P values are from linear mixed model
  4. bχ2 test: n (%, proportion for positive result: weak, positive, and strong positive)