Table 2.

Characteristics of the patients in the included studies

Study*	Mean preoperative age (years)	Mean weight [kg]	Mean Body Mass Index [kg/m 2 ]
Abdalla [15]	NR1	NR	NR
Buchs [16]	43	122.8	44
Hagen [7]	42.6	NR	44.5
Tieu [17]	46.9	131.9	47.9
Vilallonga [18]	44.7	NR	48.3
Ayloo [19]	38	152	57
Diamantis [20]	39.4	NR	48.2
Edelson [21]	45	NR	45.4
Park [22]	42.2	NR	46.77
Scozzari [8]	42.6	127.5	46.7
Curet [23]	46.5	NR	45.6
Deng [24]	41.7	NR	48
Hubens [25]	42	NR	44.2
Sudan [26]	38	NR	45
Parini [27]	42.9	NR	50.3
Mohr [28]	44	NR	46.1
Yu [29]	42	NR	50
Ali [30]	42	NR	47
Artuso [31]	42.5	146.2	52.8
Galvani [32]	NR	NR	NR
Sanchez [33]	43.3	NR	45.5
Muhlmann [34]	NR	NR	41.5

*Listed in chronological order.

¹NR: not reported.