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Table 3 Quality assessment of RCTs included by the Cochrane Collaboration tool

From: Noninvasive ventilation with helmet versus control strategy in patients with acute respiratory failure: a systematic review and meta-analysis of controlled studies

Study, year Selection bias Performance bias Detection bias Attrition bias Reporting bias
Random sequence generation Allocation concealment Blinding of participants and personnel Blinding of outcome assessment Incomplete outcome data assessments Selective reporting.
Pisani 2015 [15] Low Low High Low Low Low
Brambilla 2014 [16] Low Low High Low Low Low
Ali 2011 [29] Unclear Unclear High High Low Low
Özlem 2015 [30] Unclear Unclear High High Low Low
Antonaglia 2011 [31] Low Low High High Unclear Low
Patel 2016 [32] Low Low High Low Low Low
  1. Low low risk of bias, High high risk of bias, Unclear unclear risk of bias according to the relative information