highly significantP = 0.000
MT4-MMP and MT6-MMP Correlation in Three Groups Table 4 illustrates a highly significant correlation (PTC: r = 0.766**, P = 0.000; MNG: r = 0.856**, P = 0.000; healthy r = 0.947**, P = 0.000) between MT4-MMP and MT6-MMP plasma levels in the three studied groups.