The Effect of Preoperative Weight Loss before Gastric Bypass: A Systematic Review

Table 2

Class B studies.

Lead author	Study design	Group	Patients	Mean age	Female (%)	Results
Martin [8]	Prospective	WL (dieters)	47	40.2	74.5%	Supportive
		WG (nondiet)	53	38.8	92.5%
Still [9]	Prospective	5–10% EBWL	67	43	77.6%	Inconclusive
		5% EBWL	86	43	74.4%
		0–5% EBWG	137	43	78.8%
		>5% EBWG	169	45	79.9%
Ali [10]	Retrospective	WL > 10% TBW	23	42.7	73.9%	Supportive
		WL 5–10% TBW	102	43	87.3%
		WL 0–5% TBW	135	42.8	95.5%
		WG % TBW	91	42.1	96.7%
Fujioka [11]	Retrospective	WL (>0 lbs)	55	49	80.0%	Supportive
		WG (<0 lbs)	66	48	86.4%
Harnisch [12]	Retrospective	WL (≥10 lbs)	88	44	84.1%	Supportive
		WG (≥10 lbs)	115	41.4	85.2%
Huerta [13]	Retrospective	WL	15	50	33.3%	Inconclusive
		WG (non-WL)	25	50	28.0%

WL: weight loss; WG: weight gain; EBW: excess body weight; TBW: total body weight.