Association of presence/absence and on/off patterns of Helicobacter pylori oipA gene with peptic ulcer disease and gastric cancer risks: a meta-analysis

Table 3 Publication bias

Variable	Begg’s test		Egger’s test
Variable	z value	P value^a	t value	P value^a
For oipA on/off status studies
PUD vs. gastritis/FD	−0.63	0.531	−0.77	0.465
GC vs. gastritis/FD	0.00	1.000	0.23	0.832
For oipA presence/absence studies
PUD vs. gastritis/FD	1.05	0.293	1.64	0.163
GC vs. gastritis/FD	−0.68	0.497	−0.93	0.452

^a, P value < 0.1 was considered as significant publication bias.
Abbreviations: FD functional dyspepsia, PUD peptic ulcer disease, GC gastric cancer.

ISSN: 1471-2334