TABLE I.

Geometric mean IgG antibody concentrations (EU) to A actinomycetemcomitans and P gingivalis distributed by subject characteristics

	A actinomycetemcomitans			P gingivalis
Variable	N	Geometric mean (SE)	P	N	Geometric mean (SE)	P
Total	9372	80.3 (1.08)		9371	81.7 (1.29)
Age						<.001
12-29 y	3172	75.0 (1.00)		3171	72.7 (1.31)
30-49 y	2831	80.7 (1.63)		2831	83.4 (1.79)
50-90 y	3369	85.6 (1.27)	<.001	3369	89.9 (1.50)
Sex						.631
Male	4103	79.7 (1.18)		4103	82.0 (1.52)
Female	5269	80.8 (1.18)	.289	5268	81.3 (1.38)
Race-ethnicity						<.001
Non-Hispanic white	3423	75.2 (0.96)		3423	76.0 (1.09)
Non-Hispanic black	2925	91.4 (1.45)		2925	105.5 (1.98)
Mexican American	2561	92.7 (1.41)		2560	93.0 (1.44)
Other	463	106.2 (3.83)	<.001	463	98.3 (2.90)
Education of family reference						<.001
<12th Grade	3781	84.9 (1.06)		3780	87.1 (1.22)
12th Grade	2799	80.2 (1.41)		2799	82.5 (1.81)
>12th Grade	2728	77.7 (1.65)	.003	2728	78.2 (1.77)
Census region						.597
Northeast	1284	82.6 (3.01)		1284	81.1 (1.51)
Midwest	1839	78.3 (2.27)		1839	79.9 (3.95)
South	4507	80.2 (1.22)		4507	84.0 (1.92)
West	1742	80.5 (2.19)	.719	1741	80.5 (2.24)
Urbanization						.001
Metro areas >1 million	4545	83.7 (1.66)		4544	86.1 (1.48)
All other areas	4827	77.1 (1.05)	.001	4827	77.7 (1.58)
Serum cotinine (ng/mL)						<.001
0.035-0.100	2667	81.1 (1.81)		2667	80.9 (1.92)
0.100-10.00	4138	82.5 (1.36)		4137	84.4 (1.53)
10.00-1080.0	2361	75.8 (1.08)	<.001	2361	78.2 (1.00)
Body mass index						<.001
11.2-18.4 (Underweight)	397	78.6 (2.92)		397	75.4 (2.20)
18.5-24.9 (Normal weight)	3606	78.5 (1.06)		3605	77.6 (1.32)
25.0-29.9 (Overweight)	3016	81.0 (1.21)		3016	84.6 (1.24)
30.0-79.6 (Obese)	2332	82.9 (1.93)	.007	2332	87.1 (2.22)