Table 1. Weighted Prevalence of Helicobacter pylori Across Demographic Characteristics in US 21 to 59 Year-Olds, NHANES III (1988–1994).

			H. pylori & CagA a
		N b	Neg/Neg	Pos/Neg	Pos/Pos	P c
Latent Toxoplasmosis d	Negative	1420	69.1	8.8	22.1	<.001
	Positive	365	52.6	15.1	32.4
Gender	Female	873	68.4	9.0	22.6	.299
	Male	912	63.8	10.9	25.3
Age	20—30	553	72.8	5.8	21.4	<.001
	31—40	512	68.0	10.1	21.9
	41—50	425	63.8	10.2	25.9
	51—60	295	51.0	18.0	31.0
Race-ethnicity	Non-Hispanic white	750	74.8	8.3	16.8	<.001
	Non-Hispanic black	480	36.1	11.0	52.9
	Hispanic	498	33.1	21.9	45.0
	Other	57	30.6	19.2	50.2
Education	No high school diploma	577	46.0	15.9	38.1	<.001
	High school diploma	590	64.1	11.4	24.5
	More than high school	618	76.7	6.2	17.1
Poverty-to-income ratio d	Not in poverty	1423	68.0	8.7	23.3	<.001
	In poverty	362	50.1	20.7	29.2
Self-rated health	Poor	34	49.6	24.0	26.4	<.001
	Fair	282	46.7	20.2	33.1
	Good	647	63.7	11.4	24.8
	Very good	466	71.6	6.8	21.6
	Excellent	356	71.5	6.8	21.7
Hemoglobin	6.7 – 12.6	364	60.8	11.7	27.5	.583
	12.7 – 14.0	575	67.7	8.7	23.6
	14.1 – 18.3	846	66.9	10.1	23.0

Abbreviations: Neg, Negative; Pos, Positive.

^aPrevalence percentages are weighted to be representative of the US population. Row percentages add to 100 except for rounding error.

^bNumbers are unweighted numbers of participants.

^c P based on Pearson’s χ ²test.

^dDefined as total family income divided by poverty threshold, as determined by the US Census Bureau for the year of the interview