Compound Danshen Dripping Pill for Treating Nonproliferative Diabetic Retinopathy: A Meta-Analysis of 13 Randomized Controlled Trials

Table 2

Quality assessment of enrolled RCTs.

Studies	Adequate sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data addressed	Free of selective reporting	Free of other biases	Risk of bias
Qi et al. 2007 [11]	Unclear	Unclear	No	Unclear	Yes	No	Unclear	High
He and Zheng 2013 [12]	Unclear	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Xu 2011 [13]	Unclear	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Zhon et al. 2008 [14]	Unclear	Unclear	Unclear	Unclear	No	Yes	Unclear	High
Liu and Hao 2011 [15]	Unclear	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Meng et al. 2011 [16]	Unclear	Unclear	Unclear	Unclear	No	Yes	Unclear	High
Chen and Zhon 2006 [17]	Unclear	Unclear	Unclear	Unclear	No	Yes	Unclear	High
Zhou 2008 [18]	Unclear	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Wang et al. 2016 [19]	Unclear	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Jin et al. 2009 [20]	Unclear	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Shi 2010 [21]	Unclear	Unclear	No	Unclear	Yes	No	Unclear	High
Luo et al. 2015 [22]	Unclear	Unclear	Unclear	Unclear	Yes	No	Unclear	High
Lian et al. 2015 [23]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Low