Note
Based on preoperative characteristics, this application displays predicted weights at 1, 3, 12, 24, and 60 months after a first bariatric surgery.
- Trajectories are displayed as smooth lines for clarity.
- The range around the curve is based on the interquartile range of prediction errors.
- Predictions are based on the histories of previous individuals undergoing bariatric surgery procedures.
- This program is not intended to provide any advice on healthcare decisions but rather to help healthcare professionals in visualizing the predicted weight trajectory following bariatric surgery.
- None of the personal or health data you enter on this tool is saved on our servers.
Definition of indicators
- Total Weight Loss: percentage loss between post-op and pre-op weights after surgery. TWL = (Pre-op Weight - Post-op Weight) / Pre-op Weight * 100.
- Body Mass Index (BMI): ratio of body mass (kg) divided by the square of the body height (m). Unit: kg/m2.
- Excess Weight Loss: percentage loss of 'excess weight' after surgery. The 'excess weight' is the difference between pre-operative weight and the weight corresponding to BMI = 25.
Publication
Saux, Patrick, et al. "Development and validation of an interpretable machine learning-based calculator for predicting 5-year weight trajectories after bariatric surgery: a multinational retrospective cohort SOPHIA study." The Lancet Digital Health (2023).
Article available here