Lower Level of Bacteroides in the Gut Microbiota Is Associated with Inflammatory Bowel Disease: A Meta-Analysis

Table 1

Baseline characteristics of the included studies.

	First author
	Andoh [23]	Andoh [15]	Ashorn [16]	Basset [17]	Kleessen [18]	Sokol [19]	Swidsinski [20]	Swidsinski [21]	Takaishi [22]
Year	2011	2012	2009	2004	2002	2006	2002	2005	2008
Publication type	Full text	Full text	Full text	Full text	Full text	Full text	Full text	Full text	Full text
Data type	Continuous	Continuous	Dichotomous	Dichotomous	Dichotomous	Continuous	Continuous	Continuous	Continuous
Method of measurement	T-RFLP	T-RFLP	ELISA	PCR	FISH	FISH		FISH	QPCR
Sample evaluated	Fecal	Fecal	Fecal	Tissue	Tissue	Fecal	Fecal	Tissue	Fecal
Total # cases
CD	31	161	18	11	15	13	54	20	23
UC	31	NA	36	20	22	13	119	20	73
IC	NA	NA	4	4	NA	5	104	20	NA
Control	31	121	13	37	15	13	40	20	65
# patients	93	182	71	72	52	44	317	80	161
Age group	Adult	Adult	Adolescent	Adult	Adolescent adult	Adult	Adolescent adult	Adult	Adolescent adult
% weight	9.0	17.5	3.6	6.9	5.0	4.2	30.5	7.7	15.5

CD = Crohn’s disease, UC = ulcerative colitis, IC = indeterminate colitis, and NA = no data available; : QPCR: Real-Time Quantitative PCR.