Evaluation of the Add-On Effect of Chinese Patent Medicine for Patients with Stable or Unstable Angina: A Systematic Review and Meta-Analysis

Table 2

Methodological qualities of the included studies.

Study	Risk of bias; for randomization	Risk of bias for concealment	Risk of bias for blinding	Risk of bias for incomplete data	Risk of bias for selective outcome reporting	Risk bias for other problems
Qi et al [18], 1996	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Liu and Gong [19], 2003	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Shen et al. [20], 2003	High risk	Uncertain	Low risk	Low risk	Low risk	Low risk
Yu et al. [21], 2006	Low risk	Uncertain	Low risk	Low risk	Low risk	Low risk
Hou [22], 2007	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Yao et al. [23], 2007	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Gao et al. [24], 2008	Low risk	Uncertain	Low risk	Low risk	Low risk	Low risk
Li [25], 2008	Uncertain	Uncertain	Low risk	Low risk	High risk	Low risk
Ye [26], 2009	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Long et al. [27], 2000	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Wu and Cui [28], 2001	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Xiao et al. [29], 2001	High risk	Uncertain	Low risk	Low risk	Low risk	High risk
Deng [30], 2002	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Yang [31], 2002	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Zhao [32], 2002	Uncertain	Uncertain	Low risk	Low risk	Low risk	High risk
Gao et al [33], 2003	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Hong et al [34], 2003	Uncertain	Uncertain	Low risk	Low risk	Low risk	High risk
Nian [35], 2003	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Zhang and Hong [36], 2003	Uncertain	Uncertain	Low risk	Low risk	Low risk	High risk
Chen [37], 2004	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Chen et al. [38], 2005	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Peng [39], 2005	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Liu and Wang [40], 2006	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Yuan et al. [41], 2006	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Ning et al. [42], 2007	Low risk	Uncertain	Low risk	Low risk	Low risk	Low risk
Ma et al. [43], 2007	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Xiao [44], 2007	Low risk	Uncertain	Low risk	Low risk	Low risk	Low risk
Yang et al. [45], 2007	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Cai and Wei [46], 2008	Low risk	Uncertain	Low risk	Low risk	Low risk	Low risk
Cai [47], 2008	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Chen and Fan [48], 2008	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Liu [49], 2008	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Zhang and Chen [50], 2008	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Cai and Wang [51], 2009	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Chen and Ye [52], 2009	Uncertain	Uncertain	Low risk	High risk	Low risk	Low risk
Su et al. [53], 2009	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Wang [54], 2009	Uncertain	Uncertain	Low risk	Low risk	Low risk	High risk
Wang et al. [55], 2009	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Yu and Chen [56], 2009	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
He et al. [57], 2010	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk
Wu and Li [58], 2005	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Li et al. [59], 2008	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Dong [60], 2008	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
H. Shi and Q. Shi [61], 2009	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Shi and Jiang [62], 2009	Uncertain	Uncertain	Low risk	Low risk	Low risk	Low risk
Lin and Wu [63], 2010	Uncertain	Uncertain	Low risk	Low risk	Low risk	High risk