Zero Risk Factors		One Risk Factor		Two Risk Factors		Three or More Risk Factors		P Value
	Count	%	Count	%	Count	%	Count	%
Total	2227	10.3%	3424	15.8%	6432	29.7%	9593	44.3%
Bed Size
Less than 100	81	3.6%	129	3.8%	252	3.9%	355	3.7%
100–199	308	13.8%	540	15.8%	1076	16.7%	1544	16.1%
200–299	400	18.0%	640	18.7%	1250	19.4%	1745	18.2%
300–499	536	24.1%	724	21.1%	1459	22.7%	2076	21.6%
500 or more	902	40.5%	1391	40.6%	2395	37.2%	3873	40.4%	0.001
Teaching Status
Teaching	1386	62.2%	2174	63.5%	4067	63.2%	6203	64.7%
Nonteaching	841	37.8%	1250	36.5%	2365	36.8%	3390	35.3%	<.001
Region
East North Central	62	2.8%	135	3.9%	249	3.9%	425	4.4%
East South Central	5	0.2%	19	0.6%	32	0.5%	46	0.5%
Middle Atlantic	1154	51.8%	1646	48.1%	2953	45.9%	4419	46.1%
Mountain	146	6.6%	183	5.3%	257	4.0%	381	4.0%
New England	194	8.7%	332	9.7%	693	10.8%	962	10.0%
Pacific	138	6.2%	179	5.2%	352	5.5%	460	4.8%
South Atlantic	295	13.2%	449	13.1%	822	12.8%	1197	12.5%
West North Central	33	1.5%	54	1.6%	64	1.0%	125	1.3%
West South Central	200	9.0%	427	12.5%	1010	15.7%	1578	16.4%	<.001
Urban/Rural Location
Rural	369	16.6%	548	16.0%	959	14.9%	1808	18.8%
Urban	1858	83.4%	2876	84.0%	5473	85.1%	7785	81.2%	<.001