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. 2021 Nov 22;8:731196. doi: 10.3389/fmed.2021.731196

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Copyright © 2021 Yi, Tian, Chen, Lei, Xiao and Jiménez-Herrera.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Evidence structure of eligible comparisons for network meta-analysis. (A) weaning success. (B). reintubation. (C) SBT success. (D) ICU or LWU length of stay. All SBT techniques are represented as blue solid circles, and existing head-to-head (direct) comparisons are drawn as black solid lines. The size of every node is proportion to the number of randomly assigned participants (sample size) and the width of the lines is proportion to the number of RCTs for each pairwise comparison. PSV, pressure support ventilation; CPAP, continuous positive airway pressure; ATC, automatic tube compensation.