Table 6: Risk ratios of Chinese herbal medicines administered to prevent angina after PCI.

Chinese herbal medicineNumber of studiesNumber of patientsRisk ratio (RR)95% CI of RR

Followup 1 month
 Shan shen tong mai he ji plus RWM versus RWM1 [74]1021.180.95~1.45
 Shen mai gua lou shi xiao power plus RWM versus RWM1 [88]631.551.11~2.17
Overall (CHMs plus RWM versus RWM)*21651.311.00~1.72
Followup 3 months
 Tong guan capsule plus RWM versus RWM1 [58]521.260.98~1.64
 Yi qu huo xue formula plus RWM versus RWM1 [73]1011.070.98~1.16
Overall (CHMs plus RWM versus RWM)*21531.130.93~1.36
Followup 6 months
 Xue fu zhu yu pill plus RWM versus RWM1 [84]841.020.57~1.84
 Wen yang huo xue formula plus RWM versus RWM1 [47]1201.050.99~1.12
 Overall (CHMs plus RWM versus RWM)22041.050.99~1.12
Total overall (CHMs plus RWM versus RWM)*65221.131.02~1.26

*Random effect model
CHM = Chinese herbal medicine; CI = confidence interval; PCI = percutaneous coronary intervention; RWM = routine Western medicine.