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Table 1 Cochrane risk-of-bias assessment for included studies (RoB 2)

From: The effect of ultrasound-guided erector spinae plane block on postsurgical pain: a meta-analysis of randomized controlled trials

Authors/Year Bias arising from the randomization process Effect of assignment to intervention Effect of adhering to intervention Bias due to missing outcome data Bias in measurement of outcomes Bias in the selection of the reported result Overall risk of bias
Abu Elyazed et al. [26] 2019 Low Low Low Low Low Low Low
Aksu et al. [27] 2019 Low Some concerns Low Low Low Low Some concerns
Ciftci et al. [28] 2018 Low Some concerns Low Low Some concerns Low High
Gurkan et al. [29] 2018 Low Some concerns Low Low Low Low Some concerns
Hamed et al. [30] 2019 Low Low Low Low Low Low Low
Krishna et al. [31] 2019 Low Low Low Low Low Low Low
Oksuz et al. [32] 2019 Low Some concerns Low Low Low Low Some concerns
Singh et al. [33] 2019 Low Some concerns Low Low Some concerns Low High
Singh et al. [34] 2019 Low Some concerns Low Low Low Low Some concerns
Tulgar et al. [35] 2018 Low Low Low Low Low Low Low
Tulgar et al. [36] 2018 Low Low Low Low Low Low Low
Tulgar et al. [37] 2019 Low Low Low Low Low Low Low
Yayik et al. [38] 2019 Some concerns Some concerns Low Low Low Low High