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Table 2 Details of quality assessment of the included trials

From: Improvement of surgical complications using single-lumen endotracheal tube intubation and artificial carbon dioxide pneumothorax in esophagectomy: a meta-analysis

Author, year Selection Comparability
Comparability of cases and controls on the basis of the design or analysis
Exposure Quality assess-ment
Is the case definition adequate? Re-presentativeness of the cases Selection of Controls Definition of Controls
Ascertainment of exposure Same method of ascertainment for cases and controls Non-Response rate
Ruixiang Zhang et.al, 2014 [1] * *   * ** ** *   8
Itasu Ninomiya et.al, 2017 [15] * *   * ** ** *   8
Miao Lin et.al, 2018 [16] * *   * ** ** *   8
Shinsuke Nomura et.al, 2020 [17] * *   * ** ** *   8