Table 2.

Summary of risk of bias analysis in studies on resveratrol effect in animal models of diabetic retinopathy. None of the studies provided data on allocation concealment or blinding the groups throughout the experiment.

	Al-Hussaini et al. [29]	Chen et al. [20]	Kim et al. [34]	Kubota et al. [32]	Michan et al. [28]	Soufi et al. [22]	Soufi et al. [31]	Soufi et al. [33]	Yar et al. [30]	Zeng et al. [19]	Zeng et al. [18]
Random allocation	No data	No data	No data	No data	No data	Yes	Yes	Yes	Yes	Yes	Yes
Blinding of outcome assessment	No data	No data	No data	No data	Yes	No data	No data	No data	No data	No data	No data
Sample size calculation	No	No	No	No	No	No	No	No	No	No	No