CST3 and Hypertension: In males, a significant positive correlation was found between serum homocysteine (log10) and hypertension (r = 0.569, good correlation, P < 0.001), creatinine (r = 0.367, average correlation, P < 0.001) and cystatin C (log10) (r = 0.333, average correlation, P = 0.001).