Microscopic colitis: A large retrospective analysis from a health maintenance organization experience

Table 1 Comparison of our demographic data against published demographic data in collagenous colitis (mean ± SD)

	Total number	Age at diagnosis (yr)	Gender ratio M/F
Goff et al[8] 1997	31	66	5/26
Fernandez-Banares et al[1] 1999	23	57.8 ± 2.9	4/19
Agnarsdottir et al[9] 2002	71	66.1 ± 14.3	8/63
Olesen et al[3] 2004	51	Not reported	6/45
Koskela et al[18] 2004	30	56.5 ± 12.7	10/20
Kao et al 2006	171	63.8 ± 13.5	42/129