Table 1.

Study characteristics and quality assessment

Study	Type of surgery	Type of study	No. of patients in study/control group	JADAD/NOS quality score	ERAS elements
Ronellenfitsch et al. [8]	SG, GB, BPD	CS	65/64	6	8
Proczko et al. [9]	SG, GB, rev	CS	146/228	6	6
Pimenta et al. [10]	SG	RCT	10/10	3	4
Petrick et al. [11]	GB	CS	1184/429	5	4
Mannaerts et al. [12]	SG, GB, rev	CS	1313/654	6	15
Lemanu et al. [13]	SG	RCT	40/38	3	13
Geubbels et al. [14]	GB	CS	360/104	6	9
Dogan et al. [15]	GB	CS	75/75	5	12
Campillo-Soto et al. [16]	GB	CS	70/49	6	11
Cooney et al. [17]	GB	CS	12/16	6	9
Barreca et al. [18]	SG, GB	CS	200/88	5	12

SG sleeve gastrectomy, GB gastric bypass, rev revisionary surgery, BPD biliopancreatic diversion, CS comparative study, RCT randomized control trial