CST4 and Hypertension: The correlation coefficients ranked from high to low were age, number of night awakenings recorded by the bracelet, diabetes course, hypertension grade, hypertension course, shallow sleep duration recorded by the bracelet, age of smoking, cystatin level, glycosylated hemoglobin level, average daily smoking amount, homocysteine levels, and very low-density lipoprotein levels (Figure 3).