Table 2.

The reported prevalence of hypothyroidism in inflammatory bowel disease.

Authors (year)	Type of IBD	Prevalence in IBD	Prevalence in general populations	Reference
Snook et al. (1989)	UC	0.93% (8/858)	0.67% (2/300)	[15]
	CD	0.53% (2/378)	0.67% (2/300)	[15]
Pooran et al. (2003)	CD	3.8% (8/210)∗	8.3% (17/206)∗	[23]
Casella et al. (2008)	UC	1.9% (3/162)∗	6.3% (360/5721)∗	[5]
Yakut et al. (2011)	CD	0% (0/33)	0% (0/66)	[24]
Liu et al. (2013)	CD	2.3% (1/44)	—	[19]

IBD: inflammatory bowel disease; UC: ulcerative colitis; CD: Crohn's disease.

^∗The prevalence was significantly higher in the general populations than in IBD patients.