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A, Postoperative weight loss as a percentage of preoperative weight, according to preoperative body mass index (BMI; calculated as weight in kilograms divided by height in meters squared). B, Postoperative change in BMI. Weight at postoperative months 3, 6, 12, and 24 or later represents the mean from 2 to 4, 5 to 8, 6 to 17, and 18 months onward, respectively.
