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Table 1 Characteristics of eligible trials

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

Trials Country Groups Population(n) (Female/Male) Studydesign Subjects Outcomes
Gonzalez 2008 [7] France obese(BMI≥30 kg/m2) 70 prospective cohort study GA with endotracheal intubation Rate of difficult intubation, difficult laryngoscopy and Mallampati score≥3
non-obese(BMI<30 kg/m2) 61
Mashour 2008 [8] USA obese (BMI≥40 kg/m2) 346 prospective cohort study surgery under GA Rate of difficult intubation and difficult laryngoscopy
non-obese (BMI<40 kg/m2) 4827
Lavi 2009[14] Israel obese(BMI≥30 kg/m2) 105 prospective cohort study elective surgery with GA (exclusion emergent surgery) Rate of Mallampati score≥3
non-obese(BMI<30 kg/m2) 99
Dargin 2013 [23] USA obese (BMI≥30 kg/m2) 338 case–control study intubated in the ICUs, ED, and elsewhere in the hospital(excluded intubations performed in the operating room) Rate of difficult laryngoscopy and Mallampati score≥3
non-obese(BMI<30 kg/m2) 715
Juvin 2003 [24] France obese(BMI≥35 kg/m2) non-obese(BMI<30 kg/m2) 129
134
prospective cohort study Obese patients: laparoscopic gastroplasty; non-obese patients: inguinal hernia repair or laparoscopic cholecystectomy Rate of difficult intubation, difficult laryngoscopy and Mallampati score≥3
Basaranoglu 2010[ 25] Turkey obese (BMI>30 kg/m2) 71 prospective cohort study Consecutive women requiring GAfor emergency caesarean section Rate of difficult laryngoscopy
non-obese(BMI≤30 kg/m2) 168
Ezri 2003 [26] USA obese(BMI>35 kg/m2) 200 prospective cohort study obese patients undergoing laparoscopic weight reduction surgery (LapBand); non-obese patients underwent laparoscopic abdominal procedures Rate of difficult laryngoscopy and Mallampati score≥3
non-obese(BMI≤35 kg/m2) 1272
Heinrich 2013 [27] Germany obese(BMI≥35 kg/m2) 6334 case-control study undergoing general anesthesia for any type of surgical or diagnostic intervention Rate of difficult laryngoscopy
non-obese(BMI<35 kg/m2) 95556
Lee 2015 [28] USA obese(BMI≥30 kg/m2) 160 case–control study adult patients undergoing GA (exclusion emergency intubation) Rate of difficult laryngoscopy and Mallampati score≥3
non-obese(BMI<30 kg/m2) 184
Voyagis 1998 [29] Greece obese (BMI≥30 kg/m2) 99 prospective cohort study elective surgery under GA with endotracheal intubation( exclusion heart disease, emergency or obstetric surgery) Rate of difficult laryngoscopy and Mallampati score≥3
non-obese (BMI<40 kg/m2) 1734
Magalhaes 2013 [30] Brazil obese(≥30 kg/m2) 43 prospective cohort study undergoing GA for surgical procedures Rate of Mallampati score≥3
non-obese(<30 kg/m2) 45
Turkay Aydogmus 2014 [31] Turkey obese(BMI>30 kg/m2) 20 prospective cohort study pregnant women of ASA 1-2 scheduled for GA for cesarian operation Rate of Mallampati score≥3
   non-obese(BMI≤30 kg/m2) 20    
Aslani 2012 [32] Ireland obese (BMI>30 kg/m2) 58 case control study women referred to the anaesthetic clinic and relevant historic control groups Rate of Mallampati score≥3
   non-obese(BMI<30 kg/m2) 34    
Combes 2005 [33] United Kingdom obese(BMI>35 kg/m2) 50 prospective cohort study patients scheduled to undergo abdominal, orthopedic, or cardiac surgery GA(laryngeal mask) Rate of Mallampati score≥3
   non-obese(BMI<30 kg/m2) 50    
Yildiz 2010 [34] Italy obese (BMI>40 kg/m2) 30 prospective cohort study undergoing GA for gynecological surgery with use of the LMA CTrach Rate of Mallampati score≥3
   non-obese (BMI<30 kg/m2) 30    
Lundstrøm 2009 [35] Denmark obese(≥35 kg/m2) 4704 case control study all types of surgery (except for cardiothoracic surgery) Rate of difficult intubation
   non-obese(<35 kg/m2) 86617    
  1. GA general anesthesia, NR not reported, ICU intensive care unit, ED emergency department, ASA American Society of Anesthesiologists, IDS score the intubation difficulty scale score