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Table 3 Comparisons between patients with and without irritable bowel syndrome (IBS) 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  
  No IBS
n = 194
IBS
n = 17
p-value No IBS
n = 102
IBS
n = 37
p-value Differences between patients with IBS at the two centers (p-values)
Fibromyalgia 19/194 (10%) 1/17 (6%) 0.71## 14/101 (14%) 11/37 (30%) 0.03# 0.08##
Self-reported psychiatric disorder 30/194 (16%) 6/17 (35%) 0.04# 17/102 (17%) 12/37 (32%) 0.04# 0.84#
Hemoglobin (g/dl) 14.2 (1.1) 13.8 (1.1) 0.23 14.6 (1.0) 14.0 (1.1) 0.006 0.53
HbA1C (%) 5.8 (4.7–14.9) 5.5 (4.9–7.3) 0.02* 5.4 (4.5–11.5) 5.5 (4.9–9.7) 0.52* 0.94*
Bilirubin (μmol/l) 7 (2–23) 7 (4–19) 0.94* 7 (2–28) 5 (2–15) 0.03* 0.07*
Cholesterol (mmol/l) 4.9 (1.0) 5.1 (0.8) 0.44 4.9 (1.0) 5.5 (0.8) 0.001 0.05
Low-density lipoprotein (mmol/l) 3.1 (0.9) 3.3 (0.7) 0.26 3.2 (0.9) 3.7 (0.7) 0.001 0.07
Thyroid stimulating hormone (mU/l) 1.5 (0.0–7.9) 1.4 (0.2–14.6) 0.31* 1.5 (0.0–5.5) 2.1 (0.8–6.9) 0.001* 0.007*
Free T4 (pmol/l) 15 (11–28) 16 (12–23) 0.14* 16 (10–26) 15 (11–21) 0.04* 0.02*
Vitamin B1 (nmol/l) 157 (62–239) 145 (91–176) 0.03* 155 (104–232) 142 (112–246) 0.04* 0.58*
Use of statins 34/194 (18%) 1/17 (6%) 0.32## 18/101 (18%) 1/37 (3%) 0.02# 0.54##
  1. The results are given as number (proportion in percent) for categorical variables, mean (SD) for continuous variables with normal distribution and median (range) for other continuous variables. All the predictors that showed significant associations with IBS (p < 0.05) at one of the two centers are shown in the table. The differences between patients with and without IBS at Oslo University Hospital Aker, between patients with and without IBS at Innlandet Hospital Trust Gjøvik and between patients with IBS at Innlandet Hospital Trust Gjøvik and patients with IBS at Oslo University Hospital Aker are analyzed with t-tests, Pearson chi-squared tests (marked with #), Mann-Whitney U test (marked with *) or Fisher’s exact test (marked with ##)