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Table 2 Risk of bias in non-randomised studies -of interventions (ROBINS-I) tool

From: The association of body mass index with difficult tracheal intubation management by direct laryngoscopy: a meta-analysis

Author; Year Bias due to confounding Bias in selection of participants into the study Bias due to missing data Bias in measurement of outcomes Bias in selection of the reported result Overall bias
Gonzalez 2008 [7] Moderate Low Low Low Moderate Moderate
Mashour, 2008 [8] Moderate Low Low Low Low Low
Lavi2009[14] Moderate Low Low Low Moderate Moderate
Dargin 2013 [23] Moderate Low Moderate Low Moderate Moderate
Juvin 2003 [24] Moderate Low Low Low Moderate Moderate
Basaranoglu 2010 [25] Moderate Low Low Low Moderate Moderate
Ezri 2003 [26] Moderate Low Low Low Moderate Moderate
Heinrich 2013 [27] Moderate Low Moderate Low Moderate Moderate
Lee 2014 [28] Moderate Low Low Low Moderate Moderate
Voyagis 1998 [29] Moderate Low Low Low Moderate Moderate
Magalhães 2013 [30] Moderate Low Low Low Moderate Moderate
Turkay Aydogmus 2014 [31] Moderate Low Low Low Moderate Moderate
Aslani2012[32] Moderate Low Low Low Moderate Moderate
Combes2005[33] Serious Low Low Low Moderate Moderate
Yildiz 2010 [34] Serious Low Low Low Moderate Moderate
Lundstrøm 2009 [35] Moderate Low Low Low Low Low
  1. All parameters were assessed for their risk by using a scale that classifies them as low, moderate, serious or critical