Sulfotanshinone Sodium Injection for Unstable Angina Pectoris: A Systematic Review of Randomized Controlled Trials

Table 2

Assessment of risk of bias in included studies.

Study	Random sequence generation	Allocation concealment	Blinding	Incomplete outcome data	Selective reporting	Free of other bias	Summary assessments
Zhao 2007 [19]	U	U	H	U	U	H	H
Yan et al. [20] 2009	U	U	H	U	U	H	H
Wang and Hou 2010 [21]	U	U	H	U	U	H	H
Yang et al. 2010 [22]	U	U	H	U	U	H	H
Ge et al. 2010 [23]	U	U	H	U	U	H	H
Ge and Zhu 2009 [24]	U	U	H	H	U	H	H
Hu et al. 2009 [25]	U	U	H	U	U	H	H
Pei and Chen 2009 [26]	U	U	H	U	U	H	H
Zuo and Hou 2009 [27]	U	U	H	U	U	H	H
Song 2008 [28]	U	U	H	H	U	H	H
Xu 2008 [29]	U	U	H	L	U	H	H
Huang et al. 2008 [30]	U	U	H	U	U	H	H
Li et al. 2008 [31]	U	U	H	U	U	H	H
Hua et al. 2007 [32]	L	L	H	U	U	H	H
Wang et al. 2007 [33]	U	U	H	U	U	H	H
Ma et al. 2007[34]	U	U	H	U	U	H	H
X. G. Zhang and Y. M. Zhang 2006 [35]	U	U	H	U	U	H	H
Zhang et al. 2006 [36]	U	U	H	H	U	H	H
Liu and Yang 2010 [37]	U	U	H	H	U	H	H
Yang and Cai 2009 [38]	U	U	H	U	U	H	H
Bai and Ding 2007 [39]	U	U	H	H	U	H	H
Fang and Wang 2007 [40]	U	U	H	H	U	H	H
Jiang 2004 [41]	U	U	H	U	U	H	H
Qi and Qu 2008 [42]	U	U	H	U	U	H	H
Han and Wang 2011 [43]	U	U	H	H	U	H	H

L: low risk of bias, U: unclear, H: high risk of bias.