Association between Faecalibacterium prausnitzii Reduction and Inflammatory Bowel Disease: A Meta-Analysis and Systematic Review of the Literature

Table 2

Quality assessment of the included studies.

Author	F. prausnitzii counts	IBD diagnosis	Study type	Patient enrollment	Outcome	Samples
Machiels et al. [8]	RT-PCR	Not reported	Retrospective	Not reported	Primary	Stools
Varela et al. [12]	RT-PCR	Colonoscopy and histology	Retrospective	Not reported	Primary	Stools
Swidsinski et al. [13]	FISH	Colonoscopy	Retrospective	Not reported	Primary	Stools
Dörffel et al. [9]	FISH	Colonoscopy	Retrospective	Not reported	Primary	Stools
Vermeiren et al. [14]	RT-PCR	Not reported	Retrospective	Not reported	Primary	Stools
Joossens et al. [15]	RT-PCR	Not reported	Retrospective	Not reported	Primary	Stools
Wang et al. [16]	RT-PCR	Not reported	Retrospective	Not reported	Primary	Biopsies
Jia et al. [17]	RT-PCR	Not reported	Retrospective	Not reported	Primary	Stools
Sokol et al. [18]	RT-PCR	Not reported	Retrospective	Not reported	Primary	Stools
Andoh et al. [19]	T-RFLP	Not reported	Retrospective	Not reported	Primary	Stools
Willing et al. [20]	RT-PCR	Colonoscopy	Retrospective	Not reported	Primary	Biopsies