Table 1 Outcome parameters

Primary

Percent total weight loss

%TWL

5 years

Secondary

Percent total weight loss

%TWL

Other follow-up moments

Weight loss

• %EWL

• %EBMIL

• 22 ≤ BMI ≤ 30 kg/m²

Each follow-up moment

Defecation

• Mean daily bowel movements

• Number of days with daily bowel movements > 3 in the last 2 weeks

Each follow-up moment

Remission of T2D, hypertension, and OSA

• Current use of medication

• HbA1c

• Blood pressure

• Use of CPAP or other devices

Each follow-up moment

Nutritional deficiencies

Vitamins A, B₁, B₆, B₁₂, and D; iron; folic acid; calcium; phosphate; albumin; and zinc

6 months and 1, 2, 3, 4, and 5 years

Copper and selenium

1, 3, and 5 years

Quality of life

OBESI-Q [15]

Preoperative, 6 months, 12, 18, 30, 42, 54, and 60 months

Symptoms of dumping syndrome

DSS [16]

Preoperative, 6 months, 12, 18, 30, 42, 54, and 60 months