2.6. Primary outcome
The primary outcome will be the change in office SBP among the 3 groups from baseline to the end of the intervention (week 4). The measurement of BP will be performed with an electronic sphygmomanometer (KC2110, Shaanxi Kangshengshi Electronic Technology Co., Ltd., Shaanxi, China). Patients will be required to sit in silence for at least 5 minutes before taking their BP. Keeping the upper arm at the level of the heart, both arms will be measured at baseline and the side with the higher BP will be chosen for subsequent testing. To ensure the accuracy of the recording, the independent outcome assessor will repeat the BP measurement 3 times every 5 minutes and take the mean of the last 2 readings.