Statistical Analysis
The sample size estimation was according to the test of 2 independent proportions, with a 2.5% type 1 error rate, an intracluster correlation coefficient of 0.01, and an 80% retention rate. We aimed to have 90% power to detect a 20% absolute difference in BP control rates between the intervention and usual care group at the 6-month follow-up. According to our calculation, at least 80 evaluable patients would be required per group for this study to achieve this power.Normally distributed continuous variables were expressed as means and SDs, and medians and IQRs were otherwise presented. Categorical variables were analyzed using the chi-square test or Fisher exact test, while continuous variables were analyzed using a 2-tailed 