Table 2.

Relationship between Healthy Places Index and preterm birth among Black women living in Oakland, California (2007–2011)

	Model 1			Model 2
	Risk Ratio	95% confidence interval		Risk ratio	95% confidence interval
Intercept	0.11	0.10	0.13	0.06	0.04	0.09
Healthy Places Index
Quality
Low quality	1.00			1.00
Mild quality	0.91	0.75	1.10	0.93	0.77	1.13
Moderate quality	0.77	0.61	0.96	0.80	0.64	1.00
High quality	0.62	0.45	0.86	0.62	0.44	0.87
Parity
First live birth				1.03	0.87	1.22
Not first live birth				1.00
Nativity
Foreign-born				0.67	0.49	0.91
U.S.-born				1.00
Age				1.03	1.02	1.05
Education-for-age
High				0.67	0.53	0.84
Appropriate				1.00
Low				0.98	0.81	1.20
WIC
Yes				0.84	0.68	1.03
No				1.00
Medi-Cal
Yes				1.13	0.90	1.40
No				1.00