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Table 2 Results of critical appraisal for Randomized Controlled Trials (Cochrane, 2019)

From: The effectiveness of the laid-back position on lactation-related nipple problems and comfort: a meta-analysis

Study (year) Bias arising from the randomization process Bias due to deviations from intended interventions Bias due to missing outcome data Bias in measurement of the outcome Bias in selection of the reported result Overall risk-of-bias
Zhuang (2019) [37] Some concerns Some concerns Low risk Low risk Low risk Some concerns
Shi et al. (2017) [38] Some concerns Some concerns Low risk Some concerns Low risk High risk
Li et al. (2017) [39] Some concerns Some concerns Low risk Low risk Low risk Some concerns
Yu et al. (2019) [40] Some concerns Some concerns Low risk Low risk Low risk Some concerns
Zeng et al. (2019) [41] Some concerns Some concerns Low risk Low risk Low risk Some concerns
Puapornpong et al. (2017) [42] Low risk Low risk Low risk Low risk Low risk Low risk
Liu et al. (2019) [43] Some concerns Some concerns Low risk Low risk Low risk Some concerns
Zhang (2019) [44] Low risk Low risk Low risk Low risk Low risk Low risk
Zhao (2019) [45] Some concerns Some concerns Low risk Low risk Low risk Some concerns
Liang et al. (2017) [46] Low risk Some concerns Low risk Some concerns Some concerns High risk
Wang (2019) [47] Some concerns Some concerns Low risk Some concerns Low risk High risk