(a).

	First author
	Andoh [23]	Andoh [15]	Sokol [19]	Swidsinski [20]	Swidsinski [21]	Takaishi [22]
Year	2011	2012	2006	2002	2005	2008
Method	T-RFLP	T-RFLP	FISH	Conventional culture	FISH	QPCRΔ
Bacteroides levels in CD patients	0.01 ± 0.05∗103	21.6 ± 15.4∗103	13.8 ± 11.8	2.0 ± 5.5	70 ± 20	8.9 ± 1.2
Bacteroides levels in UC patients	0.02 ± 0.12∗103	NA	11.7 ± 11.7	1.6 ± 10	62 ± 25	9.3 ± 1.0
Bacteroides levels in IC patients	NA	NA	36.4 ± 22.9	0.64 ± 2.1	40 ± 19	NA
Bacteroides levels in control group	0	16.6 ± 5.2∗103	12.1 ± 7.0	0.02 ± 0.05	20 ± 11	9.9 ± 0.4

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