Figure 4 Correlation matrix of matrix metalloproteinases (MMPs), tissue inhibitors of metalloproteinases (TIMPs), extracellular matrix metalloproteinase inducer (EMMPRIN), tumor necrosis factor-alpha (TNFα), and other laboratory results, including C-reactive protein (CRP), white blood cell count (WBC), lymphocytes (Lymph), neutrophils (Neutr), D-dimers, and alanine aminotransferase (ALT) in adult and pediatric COVID-19 patients. Statistical analysis conducted using Spearman’s correlation coefficient. Color-coded representation with positive correlations in blue and negative correlations in red. R values are displayed within cells, and missing values indicate correlations lower than 0.01.