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Table 4 Risk of Bias Classification

From: Effect of stem cell treatment on functional recovery of spinocerebellar ataxia: systematic review and meta-analysis

Risk of Bias High Risk Low Risk Uncertain Risk
Random sequence generation Dongmei et al., 2011 [19]
Jin et al., 2013 [20]
Tsai et el., 2017 [21]
None None
Allocation concealment Dongmei et al., 2011 [19]
Jin et al., 2013 [20]
Tsai et el., 2017 [21]
None None
Blinding of participants and professionals Dongmei et al., 2011 [19]
Jin et al., 2013 [20]
Tsai et el., 2017 [21]
None None
Blinding of outcome evaluators None Dongmei et al., 2011 [19]
Jin et al., 2013 [20]
Tsai et el., 2017 [21]
Incomplete outcomes data None Dongmei et al., 2011 [19]
Jin et al., 2013 [20]
Tsai et el., 2017 [21]
None
Selective outcome reporting None Dongmei et al., 2011 [19]
Jin et al., 2013 [20]
Tsai et el., 2017 [21]
None
  1. The risk of bias was graded for each domain as high, low, or unclear. For incomplete outcome data in individual studies, we stipulated a low risk of bias for a loss to follow-up of less than 10% and a difference of less than 5% in missing data between the intervention/exposure and control groups