The relationship between TK levels and cardiovascular disease risk factors in controls subjects.

Abbreviations: TK, tissue kallikrein; BMI, body mass index; SBP, systolic blood pressure; DBP, diastolic blood pressure; HDL, high-density lipoprotein cholesterol; LDL, low-density lipoprotein cholesterol; Apo A, apolipoprotein A; Apo B, apolipoprotein B. All the subjects (898 CAD patients and 905 controls) were grouped by quarters according to plasma TK levels: Quarter 1 (396 controls and 54 cases), Quarter 2 (280 controls and 171 cases), Quarter 3 (128 controls and 323 cases), and Quarter 4 (101 controls and 350 cases). Data are means ±SD. P-values for the difference among the 4 groups, tested with One-way ANOVA and Chi square test.