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Table 1 Patients’ characteristics at the two centers

From: Prevalence and predictors of irritable bowel syndrome in patients with morbid obesity: a cross-sectional study

  Oslo University Hospital Aker   Innlandet Hospital Trust Gjøvik   
  n   n p-value
Gender (%male) 62 (29%) 211 28 (20%) 139 0.05#
Age (years) 43 (21–61) 211 44 (24–61) 139 0.66*
Body mass index (kg/m2) 43 (33–62) 211 42 (35–53) 139 0.09*
Ethnicity (% Caucasian) 195 (93%) 210 139 (100%) 139 0.001#
Irritable bowel syndrome (IBS) 17/211 (8%) 211 37/139 (26%) 139 <0.001#
 IBS-constipation 3/17 (18%) 17 7/37 (19%) 37 0.48#
 IBS-diarrhea 2/17 (12%) 17 11/37 (30%) 37  
 IBS-mixed 11/17 (65%) 17 18/37 (49%) 37  
 IBS-unsubtyped 1/17 (6%) 17 1/37 (3%) 37  
Functional bloating 21/205 (10%) 205 19/138 (14%) 138 0.32#
Functional constipation 20/205 (10%) 205 3/135 (2%) 138 0.006#
Functional diarrhea 9/206 (4%) 206 4/139 (3%) 139 0.48#
Smoking 56/204 (28%) 204 24/139 (17%) 139 0.03#
Diabetes mellitus 53/211 (25%) 211 26/139 (19%) 139 0.16#
Hypothyroidism 19/211 (9%) 211 17/138 (12%) 138 0.32#
Fibromyalgia 20/211 (10%) 211 25/138 (18%) 138 0.02#
Self-reported psychiatric disorder 36/211 (17%) 211 29/139 (21%) 139 0.37#
Hemoglobin (g/dl) 14.1 (1.1) 211 14.5 (1.1) 136 0.006
White-cell count (×109/l) 7.4 (2.4–13.3) 210 7.5 (4.2–16.1) 136 0.95*
Platelet count (×109/l) 275 (112–519) 210 276 (131–939) 134 0.46*
HbA1C (%) 5.8 (4.7–14.9) 211 5.5 (4.5–11.5) 136 <0.001*
Bilirubin (μmol/l) 7 (2–23) 210 6 (2–28) 136 0.07*
C-reactive protein (mg/l) 7 (1–50) 210 5 (0–43) 136 0.01*
Cholesterol (mmol/l) 4.9 (1.0) 210 5.1 (1.0) 136 0.10
High-density lipoprotein (mmol/l) 1.1 (0.5–2.0) 210 1.1 (0.4–2.2) 136 0.70*
Low-density lipoprotein (mmol/l) 3.1 (0.9) 210 3.3 (0.9) 136 0.02
Thyroid stimulating hormone (mIE/l) 1.4 (0–14.6) 210 1.7 (0–6.9) 136 0.11*
Free T4 (pmol/l) 15 (11–28) 210 15 (10–26) 136 0.30*
Vitamin B1 (nmol/l) 156 (62–239) 210 153 (104–246) 135 0.70*
Vitamin B6 (nmol/l) 29 (5–231) 211 22 (5–209) 133 0.01*
Vitamin B12 (pmol/l) 344 (158–1480) 211 346 (158–1401) 136 0.80*
Folic acid (nmol/l) 18 (6–46) 211 17 (7–46) 136 0.14*
Use of statins 35/211 (17%) 211 19/138 (14%) 138 0.48#
Use of thyroid substitution therapy 19/211 (9%) 211 13/139 (9%) 139 0.91#
  1. The results are given as number (proportion in percent) for categorical variables, mean (standard deviation) for continuous variables with normal distribution and median (range) for other continuous variables. Data were analyzed with with t-tests, Pearson chi-squared tests (marked with #) or Mann-Whitney U test (marked with *)