Table 3.

Independent risk factors of H pylori seropositivity in O-87 and O-97 groups of patients (N:401) (multivariate logistic regression analysis).

Variables Age(years)	Odds ratio	95% CI	p
15 – 24	1
25 – 34	2.02	(0.94, 4.37)	0.073
35 – 44	3.45	(1.59, 7.49)	0.002
45 – 54	5.07	(2.31, 11.11)	< 0.001
55 – 64	5.60	(2.57, 12.19)	< 0.001
> 65	3.49	(1.51, 8.10)	0.004
Period
1997	1
1987	1.73	(1.14, 2.65)	0.010