Table 1 Baseline characteristics

Age—years, mean (SD)

Sex—F, n (% n/N)

 Dutch

 Surinamese

 Dutch Caribbean

 Moroccan

 Turkish

 Others

Baseline weight—kg

Baseline BMI—kg/m²

Hypertension—yes, n (% n/N)

Dyslipidaemia—yes, n (% n/N)

Type 2 diabetes—yes, n (% n/N)

Pain syndrome—yes, n (% n/N)

History of abdominal surgery—yes, n (% n/N)

Medication prior to surgery—yes, n (% n/N)

 Statins

 Birth control pills

 Oestrogen

Preoperative cholecystolithiasis—yes, n (% n/N)

Type of surgery—RYGB, n (% n/N)

Baseline health utility score—n, mean (SD)