Study	Reason for exclusion
Abdi 2010	RCT comparing PLMA with TT in participants undergoing laparoscopic gynaecological surgery. No mention of obese participants
Arslan 2012	RCT comparing use of intubating LMA with LMA CTrach in morbidly obese participants (BMI > 40 kg/m2)
Borkowski 2005	RCT comparing PLMA with TT in participants undergoing laparotomy. Included participants up to BMI 35 kg/m2
Dhonneur 2006	RCT comparing use of LMA CTrach with direct laryngoscopy in morbidly obese participants (BMI > 35 kg/m2)
Hohlrieder 2007	RCT comparing PLMA with TT in participants undergoing laparoscopic gynaecological surgery. Included participants up to BMI 35 kg/m2
Khazin 2008	RCT comparing LMA classic and PLMA with TT in participants undergoing various types of surgery. Included participants up to BMI 35 kg/m2. Contact with authors confirmed no participants with BMI > 30 were in fact included
Larsson 2009	Commentary on Zoremba 2009
Li 2013	Commentary on Ydemann 2012
Lim 2007	RCT comparing PLMA with TT in participants undergoing laparotomy. Participants with BMI > 30 excluded
Maltby 2002	RCT comparing PLMA with TT in participants undergoing laparoscopic cholecystectomy. Separate randomisation stratum for participants with BMI > 30 kg/m2, but outcome data not available for obese participants
Maltby 2003	RCT comparing PLMA with TT in participants undergoing laparoscopic gynaecological surgery. Separate randomisation stratum for participants with BMI > 30 kg/m2 but outcome data not available for obese participants
Mann 2012	RCT comparing two models of SAD‐LTS (laryngeal tube suction) with PLMA
Miller 2006	RCT comparing PLMA and SLIPA with TT in participants undergoing laparoscopic gynaecological surgery. Excluded morbid obese participants
Olsen 2012	Trial comparing PLMA and TT for back surgery in the prone position. Data obtained from authors showed that 9 participants in the PLMA group were obese, but the study was excluded as PLMA was placed whilst participant was in the prone position, whereas TT placed in usual supine position, making comparison difficult
Uppal 2009	Non‐randomized study comparing i‐gel with TT
Weber 2011	RCT comparing use of i‐gel with LMA unique in mild‐moderate obese participants (BMI 25 to 35 kg/m2)
Ydemann 2012	RCT comparing use of Intubating LMA with Glidescope in morbidly obese participants (BMI > 35 kg/m2)