Shuangdan Mingmu Capsule for Diabetic Retinopathy: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

Table 2

The methodologic quality of the included trials assessed using the cochrane risk of bias tool.

References	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other bias
Tu et al. 2009 [19]	?	?	+	+	+	+	+
Pang 2015 [18]	?	?	?	?	+	+	+
Jin and Zhang 2019 [17]	?	?	?	?	+	+	+
Fu 2019 [15]	?	?	?	?	+	+	+
Liu et al. 2019 [16]	+	?	?	?	+	+	+
Zhang et al. 2021 [14]	+	?	?	?	+	+	+
Ji and Liu 2022 [20]	+	?	?	?	+	+	+

Notes: + = low risk of bias; ? = unclear risk of bias; − = high risk of bias.