An epidemiological study of collagenous colitis in southern Sweden from 2001-2010

Table 1 Mean annual incidence of collagenous colitis year by year during 2001-2010

Year	Annual incidence/105 (total)	Annual incidence/105 (women)
2001	6.6	7.8
2002	5.1	6.1
2003	4.5	4.9
2004	6.7	8.7
2005	3.9	6.5
2006	4.4	6.9
2007	3.7	6.3
2008	5.8	8.3
2009	6.4	9.1
2010	6.6	12.5

Table 2 Mean annual incidence and female:male ratio of collagenous colitis in different countries/100  000 inhabitants

Ref.	Time period	N	Mean annual incidence1	Female:male ratio
Raclot et al[32]	1987-1992		0.6
Bohr et al[13]	1984-1993	30	1.8	9
Pardi et al[14]	1985-2001	46	3.1	4.4
Fernández-Bañares et al[10]	1993-1997	23	2.3	4.8
Olesen et al[11]	1993-1998	51	4.9	7.5
Agnarsdottir et al[15]	1995-1999	71	5.2	7.9
Williams et al[16]	2002-2004	75	4.6
Fernández-Bañares et al[17]	2004-2008	40	2.6	3.4
Present study	2001-2010	198	5.4	2.8

¹Southern (left) and northern (right) latitudes. N: Number of new collagenous colitis patients.