Table 1. Summary of included studies.

Study	Country	N	Age (year)	Weight (Kg)	Surgery or patients’ condition	ASA grading	Pre-anesthetic medication	General anesthesia	Primary measurement	how OP leak pressures were obtained	Definition for the inflation protocols for the LMA-Supreme
Cao 2012 [19]	China	50	20–60	50–80	Laparoscopic gynecological and Cholecystectomy	I–II	atropine+ midazolam	fentanyl+propofol	oropharyngeal leak pressure	using the technique of static equilibrium	inflated by volume
Chew 2010 [8]	Malaysia	90	16–55	N/A	Spontaneously breathing anesthetized patients	I–II	N/A	fentanyl+propofol+sevoflurane	oropharyngeal leak pressure	using the technique of static equilibrium	inflated by volume
Eschertzhuber 2012 [18]	Germany	30	20–70	N/A	Paralyzed anesthetized patient	I–II	midazolam	fentanyl+propofol+rocuronium	oropharyngeal leak pressure	using the technique of static equilibrium	inflated by volume
Li 2011 [20]	China	120	30–60	45–90	Laparoscopic Cholecystectomy	I–II	midazolam + atropine	fentanyl+vecuronim	oropharyngeal leak pressure	using the technique of static equilibrium	inflated by volume
Ragazzi 2012 [10]	Italy	80	18+	N/A	Breast surgery	I–III	without	remifentanil+propofol	insertion success rate	unclear	unclear
Russo 2012 [1]	Germany	120	18+	N/A	Elective surgery	I–II	midazolam	sufentanil+propofol	oropharyngeal leak pressure	determined as a function of cuff pressure for the supraglottic airway devices with inflatable cuffs	inflated by volume
Teoh 2010 [4]	Singapore	100	20–80	30+	Laparoscopic gynecological	I–II	without	fentanyl+propofol+atracurium	oropharyngeal leak pressure	using the technique of static equilibrium	unclear
Theiler 2009 [17]	Switzerland	60	18–80	50+	Elective surgery	I–III	midazolam	fentanyl+propofol+remifentanil	Overall success rate	unclear	unclear
Van Zundert 2012 [9]	The Netherlands	150	18–80	50–120	elective peripheral or superficial surgery	I–II	N/A	fentanyl+propofol+sufentanil	ease of insertion	using the technique of static equilibrium	inflated by volume
Yu 2011 [21]	China	60	21–64	45–90	Laparoscopic gynecological	I–III	N/A	propofol+remifentanil+rocuronium	oropharyngeal leak pressure	using the technique of static equilibrium	inflated by volume