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Table 1 Patient characteristics at the preoperative visit and the 2 year follow-up visit after Roux-en-Y-gastric bypass

From: Irritable bowel syndrome-like symptoms and health related quality of life two years after Roux-en-Y gastric bypass - a prospective cohort study

 Preoperative visit
n = 233
Two year follow-up visit
n = 233
Statistics
(p-values)
Gender (male/female)56 (24%)/177 (76%)  
Age (years)43.5 (9.1)  
Body mass index (kg/m2)42.9 (4.9)29.5 (4.6)<0.001
Living with partner161 (71%)172 (76%)0.03
Full time work130 (58%)127 (56%)0.78
Type 2 diabetes55 (24%)18 (8%)<0.001
Hypertension98 (43%)34 (15%)<0.001
Hypothyroidism22 (10%)24 (10%)0.73
Fibromyalgia33 (14%)36 (16%)0.61
Self-reported psychiatric disorder40 (17%)37 (16%)0.76
Irritable bowel syndrome27 (12%)61 (26%)<0.001
IBS-constipation5 (2%)11 (5%)0.15
IBS-diarrhea5 (2%)12 (5%)0.09
IBS-mixed16 (7%)34 (15%)0.004
IBS-unsubtyped1 (0.4%)3 (1%)0.63
Hemoglobin (g/dl)14.2 (1.1)13.7 (1.1)<0.001
Iron (mol/L)15.1 (5.2)19.6 (6.9)<0.001
Ferritin104.5 (8–584)115.0 (4–804)0.31
White-cell count (×109/liter)7.7 (2.1)6.2 (1.9)<0.001
HbA1c (%)5.7 (4.6–14.9)5.2 (4.0–9.7)<0.001
C-reactive protein (mg/liter)7.0 (0–50.0)0.6 (0–66.0)<0.001
Cholesterol (mmol/liter)4.9 (1.0)4.3 (0.7)<0.001
High-density lipoprotein (mmol/liter)1.2 (0.3)1.7 (0.4)<0.001
Low-density lipoprotein (mmol/liter)3.2 (0.9)2.5 (0.7)<0.001
Triglycerides1.9 (1.3)1.0 (0.5)<0.001
Vitamin B1 (nmol/liter)157.4 (27.8)159.6 (27.7)0.18
Vitamin B6 (nmol/liter)36.5 (34.9)52.8 (44.0)<0.001
Vitamin B12 (pmol/liter)375.8 (166.8)531.4 (321.3)<0.001
Folic acid (nmol/liter)20.3 (9.0)22.2 (10.6)0.014
  1. The results are given as number (proportion in per cent) for categorical variables, mean (SD) for continuous variables with normal distribution and median (min-max) for other variables. Significant p-values are marked in bold
  2. Data were analyzed with McNemar test for categorical variables and paired t-tests or Wilcoxon signed-rank test (marked with†) for continuous variables
  3. For one patient, we had insufficient information for subtyping of IBS at the 2 year follow-up visit
  4. Missing variables: Living with partner (n = 7), Full time work (n = 7), type 2 diabetes (n = 3), Hypertension (n = 4) Hypothyroidism (n = 4), Fibromyalgia (n = 4), minor psychiatric disorder (n = 4), Hemoglobin (=2), Iron (n = 2), Ferritin (n = 7), White-cell count (n = 3), HbA1c (n = 2), CRP (n = 3), Cholesterol (n = 2), High-density lipoprotein (n = 2), Low-density lipoprotein (n = 2), Triglycerides (n = 2), Vitamin B1 (n = 4), Vitamin B6 (n = 4), Vitamin B12 (n = 2), Folic acid (n = 2)
  5. *Two de-novo diabetes mellitus