Table 1.

Characteristics of studies included in the meta-analysis.

No.	BioProject	Sequencing region	Country and region	Sample size				Total	HP status		Sample type	SRA	HP conventional testing method
				Healthy	Gastritis	IM	GC		(+)	(-)
1	PRJEB2110414	V1-V2	UK	22	35	10	10	77	49	28	Mucosa	ERP023334	Histology and RUT and Serology
2	PRJEB2149716	V4	Singapore, Malaysia	20			12	32	22	10	Mucosa	ERP02375	Serology
3	PRJEB2210715	V1-V2	Austria	6	20			26	19	7	Mucosa	ERP024440	Histology and PCR
4	PRJEB2693117	V4	China	56	41	54	84	235	79	156	Mucosa	ERP108962	13C-UBT
5	PRJNA31012718	V3-V4	China, Shanxi				157	157			Mucosa	SRP080738
			Mexico				134	134
6	PRJNA37577213	V4	China, Xi’an		120	41	40	201	140	61	Mucosa	SRP100168
			China, Inner Mongolia		107		36	143	101	42
7	PRJNA42888319	V3-V4	China, Zhejiang				745	745			Mucosa	SRP128749
8	PRJNA48141321	V4	China, Nanchang		115	91	114	320	142	178	Mucosa	SRP154244	Immunohistochemistry test
					41	27	28	96	46	50	Fluid
9	PRJNA49543620	V3-V4	China, Nanchang		32			32	32		Mucosa	SRP165213	13C-UBT