Ma, YunshengPagoto, Sherry L.Olendzki, Barbara C.Hafner, Andrea R.Perugini, Richard A.Mason, RobinKelly, John J.2022-08-232022-08-232006-09-232008-01-15Obes Surg. 2006 Sep;16(9):1227-31. <a href="http://dx.doi.org/10.1381/096089206778392284">Link to article on publisher's site</a>0960-8923 (Print)10.1381/09608920677839228416989709https://hdl.handle.net/20.500.14038/44739BACKGROUND: Weight loss after bariatric surgery varies and depends on many factors, such as time elapsed since surgery, baseline weight, and co-morbidities. METHODS: We analyzed weight data from 494 patients who underwent laparoscopic Roux-en-Y gastric bypass (RYGBP) by one surgeon at an academic institution between June 1999 and December 2004. Linear regression was used to identify factors in predicting % excess weight loss (%EWL) at 1 year. RESULTS: Mean patient age at time of surgery was 44 +/- 9.6 (SD), and the majority were female (83.8%). The baseline prevalence of co-morbidities included 24% for diabetes, 42% for hypertension, and 15% for hypercholesterolemia. Baseline BMI was 51.5 +/- 8.5 kg/m(2). Mean length of hospital stay was 3.8 +/- 4.6 days. Mortality rate was 0.6%. Follow-up weight data were available for 90% of patients at 6 months after RYGBP, 90% at 1 year, and 51% at 2 years. Mean %EWL at 1 year was 65 +/- 15.2%. The success rate (> or = 50 %EWL) at 1 year was 85%. Younger age and lower baseline weight predicted greater weight loss. Males lost more weight than females. Diabetes was associated with a lower %EWL. Depression did not significantly predict %EWL. CONCLUSION: The study demonstrated a 65 %EWL and 85% success rate at 1 year in our bariatric surgery program. Our finding that most pre-surgery co-morbidities and depression did not predict weight loss may have implications for pre-surgery screening.en-USAdultAge FactorsAgedFemaleFollow-Up Studies*Gastric BypassHumans*LaparoscopyLength of StayMaleMiddle AgedObesity, MorbidPredictive Value of TestsSex FactorsTreatment Outcome*Weight LossBehavioral Disciplines and ActivitiesBehavior and Behavior MechanismsCommunity Health and Preventive MedicinePreventive MedicineJournal Articlehttps://escholarship.umassmed.edu/prevbeh_pp/16413088prevbeh_pp/16