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Table 3 Incidence density rates and hazard ratios of chronic fatigue syndrome in different subgroups

From: Increased risk of chronic fatigue syndrome in patients with inflammatory bowel disease: a population-based retrospective cohort study

Subgroups N Event no. IR HRa (95% CI)
Non-IBD group 8652 128 2.39 1.00
IBD group
 Ulcerative colitis 172 6 5.88 2.06 (0.91–4.68)
 Crohn’s disease 1991 75 6.05 2.27 (1.70–3.03)***
  1. ICD-9-CM: Ulcerative colitis, 556; Crohn’s disease, 555
  2. IBD inflammatory bowel disease, IR incidence density rate, per 1000 person-years, HR hazard ratio, CI confidence interval
  3. *** P < 0.001
  4. aModel adjusted for age, cancer, diabetes, obesity, depression, anxiety, sleep disorder, and renal disease
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