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Table 2 Quality assessment of the included studies

From: Airway pressure release ventilation during acute hypoxemic respiratory failure: a systematic review and meta-analysis of randomized controlled trials

  Random-sequence generation Allocation concealment Blinding of participants and personnel Blinding of outcome assessment Incomplete outcome data Selective reporting Other bias
Putensen et al. [13] ? ? ? + ?
Varpula et al. [10] ? + ? + ? ?
Li et al. [12] ? ? ? + ? ?
Zhou et al. [11] + + ? + + +
Hirshberg et al. [16] + + ? + + +
  1. +, low risk of bias; –, high risk of bias; ?, unclear risk