Table 2.

Odds of core antibodies by demographic factors.

Categories	Chi-square (df, p-value)	Positive Screening Result	% Positive	Negative Screening Result	% Negative	Odds Ratio (95% CI)
Age	25.47(6, <0.001)
18-24		1	1.1	13	14.8	Ref.
25-34		4	4.4	15	17.0	3.47 (0.34, 35.06)
35-44		16	17.6	16	18.2	13.00 (1.52, 111.46)
45-54		18	19.8	14	15.9	16.71 (1.95, 143.57)
55-64		30	33.0	12	13.6	32.50 (3.82, 276.59)
65-74		13	14.3	12	13.6	14.08 (1.59, 124.59
75+		9	9.9	6	6.8	19.50 (1.99, 190.88)
Sex	0.55 (1, 0.460)				0.0
Male		38	41.8	32	39.1	1.255 (0.69, 2.29)
Female		53	58.2	56	60.9	Ref.
WHO Region	25.39 (2, <0.001)				0.0
Country of Origin	50.82 (24, 0.001)				0.0
Western Pacific		22	24.3	26	29.9	5.50 (1.66, 18.19)
Korea		9	9.9	11	12.5
China		11	12.1	12	13.6
Vietnam		0	0.0	1	1.1
Philippines		0	0.0	1	1.1
Taiwan		2	2.2	1	1.1
Africa		65	71.4	35	40.2	12.07 (3.90, 37.37)
Africa (not specified)		1	1.1	0	0.0
Sierra Leone		1	1.1	0	0.0
Nigeria		0	0.0	2	2.3
Benin		1	1.1	1	1.1
Mauritania		1	2.2	2	2.3
Guinea		9	9.9	2	2.3
Senegal		1	1.1	0	0.0
Ivory Coast		3	3.3	1	1.1
Mali		19	20.9	12	13.6
Burkina Faso		11	12.1	4	4.5
Niger		1	1.1	0	0.0
Liberia		11	12.1	1	1.1
Cameroon		0	0.0	1	1.1
Ethiopia		4	4.4	6	6.8
Togo		1	1.1	1	1.1
Democratic Republic of the Congo		0	0.0	1	1.1
Kenya		0	0.0	1	1.1
Americas		4	4.4	26	29.9	Ref.
Grenada		1	1.1	0	0.0
United States		3	3.3	26	29.5
Southeast Asiaa					0.0
Pakistan		0	0.0	1	1.1
Education	8.92, 2, 0.012				0.0
Less than High School		22	24.7	19	22.1	1.84 (0.85, 3.97)
GED or High School Graduate		38	42.7	21	24.4	2.87 (1.42, 5.82)
Some Higher Education or Technical School		29	32.6	46	53.5	Ref.
Vaccinated	0.048, 1, 0.826				0.0
Yes		12	16.4	13	17.8	0.91 (0.38, 2.15)
No		61	83.6	60	82.2	Ref.

^aRegion was excluded due to low counts (n = 1).