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The intragastric balloon (IGB) is an endoscopic device for the treatment of obesity. Best results are observed in patients who follow a dietary program but few studies have assessed the results of this treatment in patients with different degrees of obesity.The aim of this study is to compare the efficacy of IGB in patients with different degrees of obesity.A total of 2002 patients with IGB were retrospectively evaluated and were divided into groups according to initial body mass index (BMI) range, as follows: group 1, 27 to 29.9 kg/m2; group 2, 30 to 34.9 kg/m2; group 3, 35 to 39.9 kg/m2; group 4, 40 to 44.9 kg/m2; group 5, ≥45 kg/m2. Weight was assessed in 3 different times: before (T0), 1 month (T1), 6 months (T2), and 6 months after removal of the IGB (T3).A total of 946 patients lost follow-up. Overall, 40 (3.78%) removed the device before programmed by intolerance, and 1016 patients completed the 6-month treatment. The mean weight loss was 18.9%, excess weight loss 60.1% and an BMI reduction of 6.76 points. 6 months after removal of the balloon 842 patients had continued follow-up (82.8%). At this time, weight loss was 19.84%, excess weight loss was 59.49%, and BMI reduction of 7.06 points. In all groups there was statistical difference between the times T0 and T1 and between T1 and T2 (P<0.001). There was no statistical difference between T2 and T3, in any group.IGB provided sustained weight loss in patients who remained in dietary follow-up for 1 year.