Table 4. Yearly prevalence of ulcerative colitis and Helicobacter pylori from 2001 to 2013.

n: sample size

Calendar year	Ulcerative colitis			Helicobacter pylori
	Percent of total cases from 2001-2013	n	p-value	Percent of total cases from 2001-2013	n	p-value
2001	6.2	25,169	<0.05	10.1	15,111	<0.05
2002	6.5	26,538		10	14,936
2003	6.9	27,874		9.7	14,389
2004	7.2	29,215		9.4	13,967
2005	7	28,393		7.7	11,546
2006	7.2	29,216		8.4	12,585
2007	7.3	29,809		7.2	10,752
2008	8.8	35,678		7.1	10,531
2009	8.4	34,126		6.6	9,764
2010	8.5	34,492		6.2	9,200
2011	9.2	37,506		6.5	9,631
2012	8.3	33,702		5.7	8,449
2013	8.5	34,578		5.5	8,128