In the literature, there is a wide range of definitions employed to describe weight regain:
1. an increase of at least ten kilograms from nadir weight
2. any weight regain
3. greater than 25% EWL regain with respect to the minimal weight
4. regaining weight after successful loss to achieve a BMI > 35 kg/m2
5. increase in BMI of 5kg/m2 or more above the weight loss nadir
I would take into account patient weight after surgery. Not the same 100kg or 170Kg.
In my opinion, a 5% weight gain is significative, and definetly a 10% weight gain.
I would not use in any case BMI references neither exactly a weight in kilos.
Most authors (especially in the "Obesity Surgery" journal) define "weight regain" as a regain of >= 10% of total weight loss (maximum lost postoperative weight ). Kilograms and BMI units are not really usefull in my opinion.
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