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

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.