Assessment of thyroid cancer risk in more than 334,000 patients with inflammatory bowel disease: a case-control study and a meta-analysis

Table 3 Characteristics of included studies in the meta-analysis

First author	Year	Country	No. of IBD (n)^a	IBD male (n)	IBD age at diagnosis (years)	IBD type	No. of controls (n)	Control type	Quality score
This study	2018	China	1392	634	Mean 26.9	Single center	1392	Patient	7
Jung	2017	Korea	15,291	9743	Mean 38.6	Population	1,529,100	Normal	7
So	2017	China	1603	893	Median CD 40/UC 53 ^a	Population	160,300	Normal	7
Wadhwa	2016	USA	289,935	125,635	Mean 50.1	Population	315,145	Patient	7
Jussila	2013	Finland	21,964	11,810	NM	Population	2,196,400	Normal	7
Yano	2013	Japan	770	531	Mean 23.1	Single center	77,000	Normal	6
Sonu	2013	USA	2686	913	Mean 47.5	Single center	1638	Patient	6
Jess	2004	Denmark	374	157	NM	Population	37,400	Normal	7

^aIBD inflammatory bowel disease, NM not mentioned, CD Crohn’s disease, UC ulcerative colitis

ISSN: 1477-7819