What are stats of successful bariatric surgery?

 Weight loss surgery is considered successful:  When a patient loses 50% or more of excess body weight EBW  Keeps the weight off for at least five years %EBW loss after 5 years:  Gastric-bypass & Minigastric-bypass: the average weight loss is 50-70 percent  Gastric Banding: patient may lose an average of 30 to 40 percent  Sleeve Gastrectomy: the average weight loss is between 55 to 70 percent