Table 4: Risk ratios of Chinese herbal medicines administered to prevent recurrent angina after PCI.

Chinese herbal medicine Number of studies Number of patients Risk ratio (RR) 95% CI of RR Bu xin yin plus RWM versus RWM 1 [76] 44 0.60 0.33~1.10 Dan hong tong mai capsule plus RWM versus RWM 1 [91] 138 0.24 0.07~0.82 Dan shen plus RWM versus RWM 5 [44, 50, 57, 85, 86] 390 0.24 0.15~0.41 Guan tong formula plus RWM versus RWM 1 [54] 120 0.27 0.08~0.93 Jia wei xue fu zhu yu particle plus RWM versus RWM 1 [51] 60 0.45 0.18~1.15 Jiang lian he ji plus RWM versus RWM 1 [63] 69 0.71 0.30~1.70 Lei gong teng plus RWM versus RWM 1 [64] 75 0.39 0.17~0.94 Liang xue shen ji formula plus RWM versus RWM 1 [46] 97 0.52 0.16~1.65 Shu xue tong injection plus RWM versus RWM 1 [56] 43 0.37 0.11~1.25 Shu xin yin plus RWM versus RWM 1 [75] 44 0.60 0.33~1.10 Tong guan capsule plus RWM versus RWM 1 [70] 50 0.67 0.22~2.01 Tong mai yi xin plus RWM versus RWM 2 [54] 272 0.41 0.26~0.65 Tong xin luo plus RWM versus RWM 3 [79, 82, 90] 344 0.27 0.13~0.54 Wen tong jian plus RWM versus RWM 1 [87] 467 0.30 0.17~0.52 Wen yang huo xue formula plus RWM versus RWM 1 [47] 120 0.53 0.38~0.75 Xue fu zhu yu pin plus RWM versus RWM 2 [72, 84] 157 0.44 0.25~0.78 Xue yu tong he ji plus RWM versus RWM 1 [69] 36 0.67 0.23~1.97 Xue zhi kang plus RWM versus RWM 1 [48] 60 0.38 0.16~0.94 Xiong shao capsule plus RWM versus RWM 2 [40, 80] 173 0.48 0.31~0.75 Yi qi hua yu formula plus RWM versus RWM 1 [41] 60 0.44 0.15~1.29 Yi xin capsule plus RWM versus RWM 1 [77] 94 0.46 0.20~1.05 Self-prepared guan tong decoction plus RWM versus RWM 1 [83] 40 0.33 0.11~1.05 Overall (CHM plus RWM versus RWM) 31 2953 0.40 0.35~0.47 Xiong shao capsule plus RWM versus RWM plus placebo 2 [67, 81] 422 0.25 0.17~0.37 CHM plus RWM versus RWM plus placebo 2 422 0.25 0.17~0.37

CHM = Chinese herbal medicine; CI = confidence interval; RWM = routine Western medicine.