Introduction: Comparative weight loss analysis between the gastric bypass (GB) and the adjustable gastric bypass (AGB) is difficult due to the need for long-term follow-up the need to control for potential confounders (i.e. initial BMI).
Methods: Longitudinal mixed-effects models were used to analyze weight loss after either the GB or AGB. The multivariable analysis included controls for initial weight, height, gender, institution, age and procedure.
Results: 1402 bariatric operations were examined between 2000-2007 (1168 LGB and 238 AGB). Percent follow-up at 1, 2, 3 and 4 years after GB was 97% (786/808), 83% (440/531), 66% (164/249), 45% (27/79) and after the AGB was 83% (174/209), 65% (111/170), 65% (81/125), 56% (46/83). There were no known deaths at any time period. Comparing patient characteristics of the LGB and AGB cohorts, there were significant differences in initial BMI, initial weight and height while no difference in age and gender. Percent EWL at 1, 2, 3 and 4 years was significantly greater for the GB than the AGB at all time spans (70, 79, 76, 70% versus 35, 43, 40, 41%, respectively). Predictors of greater weight loss after the GB were increasing initial weight and male gender (both, p
Program Number: P015