Percentage changes in body composition parameters at 6 and 12 mo after Roux-en-Y gastric bypass. Values are mean ± SD. N = 46 for 6-mo changes; N = 44 for 12-mo changes. *P < 0.05 compared with baseline by paired t test. ¥, 12 mo significantly different than 6 mo by paired t test (P < 0.05). EBWL, excess body weight loss.