Table 2.

Study Characteristics by H. pylori and H. pylori-CagA Sero-status, in a Subset of the H. pylori-Colorectal Cancer Consortium (NYUWHS, PLCO, SCCS, WHI, and MEC), 1985–2009

	H. pylori − (n = 2,550)		H. pylori + (n = 1,926)		H. pylori− and/or CagA− (n = 3,106)		H. pylori+ and CagA+ (n = 1,370)
	n	%	n	%	n	%	n	%
Age, yearsa
<60	698	27	641	33	838	27	501	37
60-69	1235	48	827	43	1490	48	572	42
≥70	617	24	458	24	778	25	297	22
Year of birtha, b
Before 1925	171	12	201	14	232	13	140	13
1925 – 1935	696	48	571	39	871	48	396	36
1936 – 1945	397	27	341	23	474	26	264	24
1946 – 1953	121	8	194	13	163	9	152	14
1954 or later	70	5	169	11	88	5	151	14
Missing	1,095		450		1,287		267
Cohorta
NYUWHS	240	9	227	12	314	10	153	11
PLCO	760	30	436	23	910	29	286	21
SCCS	223	9	539	28	319	10	443	32
WHI	1095	43	450	23	1278	41	267	19
MEC	232	9	274	14	285	9	221	16
Sexa
Female	1,955	77	1,296	67	2,364	76	887	65
Male	595	23	630	33	742	24	483	35
Racea
Whitec	2,211	87	1,081	56	2,654	85	638	47
African American	339	13	845	44	452	15	732	53
Educationa
≤HS	714	28	913	47	945	30	682	50
Technical school or some college	845	33	574	30	1,021	33	398	29
≥College	991	39	439	23	1,140	37	290	21
BMI, [kg/m2]a
<30	1,791	71	1,264	66	2,157	70	898	66
≥30	721	29	638	34	905	30	454	34
Missing	38		24		44		18
Smokinga
Never	1,157	46	801	42	1,407	46	551	41
Ever	1,371	54	1,110	58	1,672	54	809	59
Missing	22		15		27		10

Abbreviations: −, sero-negative; +, sero-positive; HS, high school; BMI, body mass index.

^aP < 0.05 in Chi-Square test, two-sided, compared to respective sero-negative group.

^bWHI did not provide data on year of birth.

^cIncludes non-Latino and Latino whites.