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RYBG: Roux-en-Y gastric bypass; SG: Sleeve gastrectomy; AGB: Adjustable gastric banding
| Time Duration | Weight Loss Percentage-Surgical (Mean) | 95% Confidence Interval |
| 4 years | RYGB: 27.5% | 23.8% to 31.2% |
| AGB: 10.6% | 0.6% to 20.6% | |
| SG: 17.8% | 9.7% to 25.9% | |
| RYGB vs. AGB: 16.9% more in RYGB | 6.2% to 27.6% | |
| RYGB vs. SG: 9.7% more in RYGB | 0.8% to 18.6% | |
| 10 years | RYGB: 21% | 11% to 31% |
