Ligustrazine for the Treatment of Unstable Angina: A Meta-Analysis of 16 Randomized Controlled Trials

Table 2

Methodological quality of the included studies.

Studies	Random sequence; generation	Allocation; concealment	Blinding of participants; and personnel	Blinding of outcome; assessment	Incomplete; outcome data	Selective; reporting	Other bias
Guo 2007 [25]	Low risk	Unclear	Low risk	Low risk	Low risk	Low risk	Low risk
Liao and Luo 2006 [26]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Da 2008 [27]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Rong et al. 2001 [28]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Peng 2014 [29]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Wang and Hua 2004 [30]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Wei et al. 2012 [31]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Wang 2006 [32]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Zhou 2008 [33]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Li 2010 [34]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Sun 2007 [35]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Wang 2008 [36]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Fan 2014 [37]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Fu and Lin 2009 [38]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Meng et al. 2005 [39]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk
Wang et al. 2005 [40]	Low risk	Unclear	Unclear	Unclear	Low risk	Low risk	Low risk