The Efficacy of Tai Chi and Qigong Exercises on Blood Pressure and Blood Levels of Nitric Oxide and Endothelin-1 in Patients with Essential Hypertension: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

Figure 18

Risk of Bias in the included RCTs (red, yellow, and green labels indicate high risk, unclear risk, and low risk, respectively).