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Table 1 Assessment of quality of non-RCT studies (NOS)

From: Laparoscopic versus open approach in gastrectomy for advanced gastric cancer: a systematic review

References   Selection Comparability Outcome  
Year REC SNEC AE DO SC AF AO FU FUO Score
Zhang et al. [40] 2017 * * * * *   * * * 8
Xu1 et al. [39] 2017 * * * * * * * * * 9
Lu et al. [37] 2016 * * * * * * * * * 9
Hao et al. [33] 2016 * * * * *   * * * 8
Zhang et al. [32] 2015 * * * * *   * * * 8
Wu et al. [31] 2015 * * * * *     * 6
Gordon et al. [25] 2013 * * *   * * * * * 8
Bo et al. [24] 2013 * * * * * * * * * 9
Chun et al. [20] 2012 * * * * *   * * * 8
Chen et al. [19] 2012 * * * * * * * * * 9
Zhao et al. [18] 2011 * * * * *   * * * 8
Shuang et al. [17] 2011 * * * * *   * * * 8
Shinohara et al. [27] 2013 * * * * * * * * * 9
Li3 et al. [42] 2018 * * * * * * * * * 9
Chan et al. [45] 2019 * * * * * * * * * 9
Fang et al. [28] 2014 * * * * * * * * * 9
Xu2 et al. [49] 2018 * * * * * * * * * 9
Huang et al. [14] 2010 * * * * * *     6
Hamabe et al. [21] 2012 * * * * * * * * * 9
Scatizzi et al. [16] 2011 * * * * *   * * * 8
Inokuchi et al. [41] 2018 * * * * * * * * * 9
Li1 et al. [35] 2016 * * * * * *     6
Zhang et al. [38] 2016 * * * * * * * * * 9
Kinoshita et al. [46] 2019 * * * * * * * * * 9
Kim et al. [22] 2012 * * *   * * * * * 8
Moisan et al. [23] 2012 * * * * *   * * * 8
Qiu et al. [29] 2014 * * * * * *     6
Lin et al. [26] 2013 * * * * * * * * * 9
  1. REC representativeness of the exposed cohort, SNEC selection of the non-exposed cohort, AE ascertainment of exposure, DO demonstration that outcome of interest was not present at start of study, SC study controls for age and sex, AF study controls for any additional factors, AO assessment of outcome, FU follow-up long enough for outcomes to occur, FUO adequacy of follow-up of cohorts