This study aims to assess the impact of preoperative anemia status on anemia and related nutrient abnormalities 1 year after bariatric surgery.
This study aims to assess the impact of preoperative anemia status on anemia and related nutrient abnormalities (ferritin deficiency, vitamin B12 deficiency, folate deficiency, and low transferrin saturation level) at 1 year after bariatric surgery.
Study Type
OBSERVATIONAL
Enrollment
400
Yuntao Nie
Beijing, China
Odds ratio (OR) for anemia by preoperative anemia status
Multivariable logistic regression will be performed to assess the association between preoperative anemia and postoperative anemia. Several factors will be adjusted: sex, age, BMI, waist circumference, hip circumference, surgery, smoking, alcohol, hypertension, diabetes, hyperuricemia, hypercholesterolemia, and hypertriglyceridemia.
Time frame: 1 year
Percentage of postoperative anemia
Percentage of postoperative anemia,, , and low transferrin saturation level.
Time frame: 1 year
Percentage of anemia severity
Percentage of anemia severity (mild: hemoglobin≥110g/L; moderate: hemoglobin≥80g/L; severe: hemoglobin\<80g/L).
Time frame: 1 year
Percentage of ferritin deficiency
Percentage of ferritin deficiency, which is defined as ferritin less than 30 ng/mL.
Time frame: 1 year
Percentage of vitamin B12 deficiency
Percentage of ferritin deficiency, which is defined as vitamin B12 less than 150 pmol/L.
Time frame: 1 year
Percentage of folate deficiency
Percentage of folate deficiency, which is defined as folate less than 10 nmol/L.
Time frame: 1 year
Percentage of low transferrin saturation level
Percentage of low transferrin saturation level, which is defined as transferrin saturation less than 20%.
Time frame: 1 year
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