CST3 and Hypertension: The specific assignment method was as follows: first, the regression coefficients of each independent risk factor (norepinephrine, normetanephrine, metanephrine, serum uric acid, serum creatinine, duration of hypertension, and cystatin C) were standardized; then, a base score (0 points for the minimum value of each factor within the normal clinical range) was set, and the score for each factor level was calculated according to the standardized coefficients.