Fig. 5

Correlation analysis of serum level of MMP-9 to parameters of metabolic syndrome. a Correlation between serum level of MMP-9 and systolic blood pressure. b Correlation between serum level of MMP-9 and diastolic blood pressure. c Correlation between serum level of MMP-9 and waist circumference. d Correlation between serum level of MMP-9 and blood triglycerides. e Correlation between serum level of MMP-9 and blood HDL-C. f Correlation between serum level of MMP-9 and fasting blood glucose. g Correlation between serum level of MMP-9 and age. Pearson’s correlation analysis was performed. Statistical significance was accepted at p < 0.05. Black diamond refers to the data of MetS-positive subjects. Open triangle refers to the data of MetS-negative subjects