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

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

Subgroups	N	Event no.	IR	HR^a (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)***

ICD-9-CM: Ulcerative colitis, 556; Crohn’s disease, 555
IBD inflammatory bowel disease, IR incidence density rate, per 1000 person-years, HR hazard ratio, CI confidence interval
*** P < 0.001
^aModel adjusted for age, cancer, diabetes, obesity, depression, anxiety, sleep disorder, and renal disease

ISSN: 1479-5876