To develop and validate a prediction model for estimating the short and long-term risk of anemia after bariatric surgery.

This study aims to develop and validate a prediction model for estimating the probability of anemia for patients with obesity one, three, and five years after sleeve gastrectomy and Roux-en-Y gastric bypass, using preoperative clinical and laboratory data.

Inclusion Criteria:

• aged between 16-70 years;
• body mass index (BMI) ≥ 27.5 kg/m2;
• complete preoperative and follow-up data.

Exclusion Criteria:

• vegetarian;
• other bariatric procedures;
• renal failure at baseline;
• postoperative bleeding (it was defined as a drop in hemoglobin levels > 3 g/dL or a confirmed blood loss requiring treatment after surgery);
• incomplete preoperative and follow-up data.

This study aims to include patients with obesity who will undergo bariatric surgery.

Due to the medical privacy implications of the study data, the principal investigator needs to be contacted for access.