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Table 1 Outcome parameters

From: Tailoring limb length based on total small bowel length in one anastomosis gastric bypass surgery (TAILOR study): study protocol for a randomized controlled trial

  Outcome Measurement Time point
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
  1. TWL total weight loss, EWL excess weight loss, EBMIL excess BMI loss, BMI body mass index, T2D diabetes mellitus type 2, OSA obstructive sleep apnea
  2. Follow-up moments: 6, 12, 18, 24, 30, 36, 42, 48, 54, and 60 months