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Table 2 Assessment of the quality of the studies based on the NOS

From: Robotic versus laparoscopic gastrectomy for gastric cancer: a systematic review and meta-analysis

Study Selection (out of 4) Comparability (out of 2) Outcomes (out of 3) Total (out of 9)
(1) (2) (3) (4) (5) (6) (7)
Zhang [21] * * * * ** *    7
Liu [22] * * * * ** *    7
Huang [23] * * * * ** *    7
Zhou [24] * * * * ** * * * 9
Son T [25] * * * * ** * * * 9
Han [26] * * * * ** * * * 9
Lee [27] * * * * * * * * 8
Suda [28] * * * * * *   * 7
Shen [29] * * * * ** *    7
Hong [30] * * * * ** *    7
Lan [31] * * * * ** *    7
Zhang [32] * * * * ** * * * 9
Li [33] * * * * ** * *   8
Obama [34] * * * * ** * * * 9
Gao [35] * * * * ** * * * 9
Sun [36] * * * * ** *    7
Ye [37] * * * * ** *    7
Kong [38] * * * * ** *    7
Cui [39] * * * * ** *    7
  1. (1) Representativeness of the exposed cohort, (2) selection of the non-exposed cohort, (3) ascertainment of exposure, (4) demonstration that outcome of interest was not present at start of study, (5) assessment of outcome, (6) was follow-up long enough for outcomes to occur, (7) adequacy of follow-up of cohorts