Table 3. Predictors of Having a Smoke-Free Policy^a Among Multiunit Affordable Housing Properties by Size of Management Company, North Carolina,^b 2013.

Variables	Small Companyb		Medium Companyd		Large Companye
	Odds Ratio (95% CI)	P Valuef	Odds Ratio (95% CI)	P Valuef	Odds Ratio (95% CI)	P Valuef
Children
Number of children per unitg	0.7 (0.2–2.1)	.50	0.1 (0.0–0.6)	.02	0.1 (0.0–0.4)	.003
Quadratic term for the number of children per unit	1.1 (0.7–1.7)	.67	3.9 (0.9–15.2)	.05	2.7 (1.2–6.0)	.02
Year built
≤2001	0.3 (0.1–0.5)	<.001	0.4 (0.2–0.8)	.005	0.2 (0.1–0.3)	<.001
>2001	1 [Reference]
Access to residential units
Interior hallway	0.6 (0.3–1.3)	.22	3.4 (1.7–7.0)	<.001	1.1 (0.4–3.0)	.85
Outside or both	1 [Reference]
Number of stories in residential buildings
1 or 2	1.2 (0.5–2.5)	.70	3.7 (1.4–10.1)	.01	0.3 (0.1–0.7)	.006
3 or more	1 [Reference]

Abbreviation: CI, confidence interval.

^a Properties were defined as having a smoke-free policy if they did not allow smoking in any residential units.

^b All multiunit properties in North Carolina that receive site-based federal subsidies or state low-income housing tax credits. This sample comprised properties owned by for-profit and nonprofit private owners and did not include public housing properties.

^c Small companies were defined as managing 1 to 27 properties in North Carolina.

^d Medium companies were defined as managing 28 to 79 properties in North Carolina.

^e Large companies were defined as managing 80 to 171 properties in North Carolina.

^f Logistic regression model of predictors of smoke-free policies by management company size.

^g Number of children per property divided by the number of units per property.