Table 2.

Relationship between hopQ genotype and status of other virulence factors of Helicobacter pylori

	Virulence factor		hopQ type I	hopQ type II	P-value	ϕ value	Contingency value
Asian population	cagA	Positive	251	2	0.90	−0.008	0.008
		Negative	2	0
	vacA s-region	s1	273	2	1.00	–	–
		s2	0	0
	vacA m-region	m1	223	2	0.60	−0.032	0.032
		m2	30	0
Western population	cagA	Positive	149	42	< 0.01	0.613	0.513
		Negative	2	42
	vacA s-region	s1	148	37	< 0.01	0.731	0.528
		s2	3	47
	vacA m-region	m1	129	21	< 0.01	0.609	0.489
		m2	22	63