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Table 5 Risk of bias assessment of retrospective studies

From: The effects of several postoperative adjuvant therapies for hepatocellular carcinoma patients with microvascular invasion after curative resection: a systematic review and meta-analysis

  Adequacy of case definition Case number Representativeness of the cases As of interventions As of detection method As of cutoff As of outcome Adequacy of follow up NOS score
Huang, 2019 [23] Low risk High risk High risk Low risk Low risk Low risk Low risk Low risk 7
Jin, 2014 [21] Low risk High risk High risk Low risk High risk Low risk Unclear risk Low risk 5
Liu, 2016 [20] Unclear risk High risk Low risk Low risk Low risk Unclear risk High risk High risk 5
Liu, 2016 [18] Low risk Low risk High risk Low risk Low risk Low risk Low risk Low risk 8
Sun, 2016 [19] Low risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk 8
Wang, 2018 [16] Low risk High risk Low risk Low risk Low risk Low risk Low risk Low risk 8
Wang, 2017 [13] Low risk High risk Low risk Unclear risk Low risk Low risk Low risk Low risk 7
Wang, 2019 [12] Low risk High risk Low risk Low risk Low risk Low risk Low risk Low risk 8
Wang, 2019 [11] Low risk Low risk Unclear risk Low risk Unclear risk Low risk Low risk Low risk 7
Xiao, 2019 [14] Low risk High risk Low risk High risk Low risk Unclear risk High risk Low risk 5
Ye, 2017 [17] Unclear risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk 8
Qi, 2019 [22] Low risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk 7
  1. AS Ascertainment