TABLE 2.

Relationship of Periodontal Examination Parameters With Severe Periodontitis and Secondhand Smoke Exposure, Adjusted for Age, Gender–Hormone Replacement Therapy, Education, and Center–Race: Atherosclerosis Risk in Communities Study; Forsyth County, NC; Jackson, MS; suburban Minneapolis, MN; and Washington County, MD; 1996–1998

Examination Parameters	No.	Periodontitis case, %	P	Exposure to Secondhand Smoke, %	P
Bleeding on probing			.001		.005
< 15% of sites	1155	3.4		30.4
≥ 15% of sites	1584	25.3		36.2
Clinical attachment levels ≥ 3 mm			.001		.017
< 60% of sites	2626	13.7		33.3
≥ 60% of sites	113	68.9		44.8
Clinical attachment levels ≥ 3 mm			.001		.018
< 25% of sites	2156	7.9		33.3
≥ 25% of sites	583	46.0		44.7
Probing pocket depths ≥ 4 mm			NA		.204
< 2% of sites	1428	0.0		32.6
≥ 2% of sites	1311	33.4		35.1
Dental plaque, PI ≥ 1a			.001		.009
< 15% of sites	949	8.3		30.5
≥ 15% of sites	1639	19.5		36.0
Dental plaque, PI ≥ 2a			.001		.055
< 15% of sites	2399	14.1		33.4
≥ 15% of sites	189	32.1		40.9

Note. NA = not applicable; PI = increase in dental plaque.

^aNumbers do not total 2739 due to missing values.