BMC Anesthesiology

Table 2 Methodological quality assessment of included trials

From: Non-invasive ventilation for preoxygenation before general anesthesia: a systematic review and meta-analysis of randomized controlled trials

Study	D1^a	D2^b	D3^c	D4^d	D5^e	Overall
2001 Cressey	SC^f	L^g	L	L	L	L
2004 Herriger	SC	L	L	L	L	L
2004 Coussa	SC	SC	SC	L	L	SC
2005 Gander	SC	H^h	SC	L	L	H
2008 Delay	L	L	L	L	L	L
2011 Futier	L	L	L	L	L	L
2012 Georgescu	SC	SC	SC	L	L	SC
2014 Harbut	L	L	L	L	L	L
2015 Hanouz	L	L	L	L	L	L
2015 Edmark	L	L	L	L	L	L
2015 Baltieri	L	L	L	L	L	L
2015 Sreejit	L	L	L	L	L	L
2016 Abou-Arab	L	L	L	L	L	L

^aD1: Bias arising from the randomization process
^bD2: Bias due to deviations from intended interventions
^cD3: Bias due to missing outcome data
^dD4: Bias in measurement of the outcome
^eD5: Bias in selection of the reported result
^fSC Some concerns, ^gL Low risk, ^hH High risk

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ISSN: 1471-2253

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