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Table 2 Risk of bias assessment of included cohort studies

From: Video-assisted thoracoscopic surgery versus muscle-sparing thoracotomy for non-small cell lung cancer: a systematic review and meta-analysis

  Selection Comparability Outcome Total score
Exposed cohort Non-exposed cohort Ascertainment of exposure Outcome of interest Assessment of outcome Length of follow-up Adequacy of follow up
Asamura 8
Chen 6
Guerrera 8
Hu 7
Ichinose 7
Ilic 6
Legras 7
Li (case control) 8
Li (combined) 8
Liu 6
Luo 7
Misthos 6
Misthos 6
Nakagiri 8
Ohta 8
Prenzel 6
Riquet 8
Sonobe 7
Tanaka 8
Tomina 6
Tomizawa 8
Wang 7
Wang 6
Wang 5
Yoshino 6
Zhang 6
Zhao 7
Zheng 6
  1. Risk of bias was evaluated with use of the Newcastle-Ottawa Scale in cohort studies. A score of 7 or higher indicates a low risk of bias