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Table 2 Quality assessment based on the NOS for observational studies

From: Systematic review and meta-analysis of totally laparoscopic versus laparoscopic assisted distal gastrectomy for gastric cancer

Author Selection (out of 4) Comparability (out of 2) Outcomes (out of 3) Total (out of 9)
Representativeness of exposed cohort Selection of non-exposed cohort Ascertainment of exposure Outcome not present at the start of the study Assessment of outcomes Length of follow-up Adequacy of follow-up
Song * * * * ** *    7
Ikeda * * * * ** *    7
Kinoshita * * * * ** *   * 8
Kim MG * * * * * *    6
Lee * * * * ** *    7
Kim DG * * * * * *   * 7
Kim HG * * * * * *    6
Choi * * * * ** *    7
Chen * * * * ** * * * 9
Zhang * * * * ** *    7
Han * * * * * *    6
Kanaji * * * * ** *    7