Table 2.

Weighted Logistic Regression Model Showing the Association Between Demographic Factors and Helicobacter pylori Seroprevalence in NHANES III (1988–1991) and NHANES (1999–2000)

Variable	NHANES IIIa		NHANES 1999–2000a
	OR	95% CI	OR	95% CI
Race/ethnicity
Non-Hispanic white	Referent		Referent
Non-Hispanic black	3.41	2.81, 4.13	3.12	2.46, 3.94
Mexican American	2.79	1.98, 3.92	3.05	2.10, 4.44
Age categories, years
20–29	Referent		Referent
30–39	2.50	2.06, 3.03	1.46	0.93, 1.35
40–49	2.85	2.32, 3.51	1.90	1.24, 2.90
50–59	4.77	3.70, 6.15	2.84	1.87, 4.32
60–69	6.94	5.60, 8.60	2.65	1.56, 4.51
≥70	9.10	6.87, 12.06	3.82	2.30, 6.36
Income/poverty ratio
Above 3 times the poverty index	Referent		Referent
Between 1 and 3 times the poverty index	1.33	1.12, 1.59	1.11	0.93, 1.35
At or below the poverty index	1.51	1.14, 2.01	1.73	1.25, 2.39
Education
At least some college	Referent		Referent
Completed high school	1.76	1.42, 2.17	1.87	1.46, 2.38
Some high school	2.44	2.04, 2.92	2.55	1.7, 3.29
No high school	2.85	2.32, 3.50	4.87	3.66, 6.47
Not US born	2.67	1.87, 3.82	2.34	1.63, 3.38

Abbreviations: CI, confidence interval; NHANES, National Health and Nutrition Examination Survey; NHANES III, Third National Health and Nutrition Examination Survey; OR, odds ratio.

^aEach odds ratio is adjusted for all the other variables in the first column of the table.