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Table 2 Newcastle-Ottawa scale as a quality assessment

From: Pancreaticoduodenectomy versus limited resection for duodenal gastrointestinal stromal tumors: a systematic review and meta-analysis

Author, year Selection Comparability Outcome Total score
Exposed cohort Non-exposed cohort Ascertainment of exposure Outcome of interest Control for factor Assessment of outcome Follow-up long enough Adequacy of follow-up
Gu [28], 2018 * * * * *   * * 7
Lee, [21] 2018 * * * * *   * * 7
Zhang, [22] 2018 * * *   *   * * 6
Shi, [19] 2017 * * * * *   * * 7
Chen, [23] 2017 * * * * *   * * 7
Sugase, [20] 2016 * * * * *   * * 7
Duffaud, [29] 2014 * * * * *   * * 7
Zhou, [30] 2013 * * * * *   * * 7
Colombo, [15] 2012 * * * * *   * * 7
Tien, [31] 2010 * * * * *   *   6