TABLE 3.
Estimates of the association between tract-level percent black and preterm birth among non-Hispanic black and white women in Wake and Durham
| Less deprived tracts (below median)b |
More deprived tracts (median and above)b |
|||||||
|---|---|---|---|---|---|---|---|---|
| White
|
Black
|
White
|
Black
|
|||||
| Variables | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI |
| Tract-level percent blacka | 1.10 | 0.95,1.27 | 1.09 | 0.88,1.34 | 1.07 | 0.95,1.20 | 1.05 | 0.98,1.12 |
| Maternal age (continuous) | 1.01 | 0.99,1.02 | 1.03 | 1.01,1.06 | 1.00 | 0.98,1.02 | 1.03 | 1.02,1.05 |
| Educational attainment | ||||||||
| > 12 years | 1.00 | -- | 1.00 | -- | 1.00 | -- | 1.00 | -- |
| = 12 years | 1.41 | 1.15,1.72 | 1.47 | 1.11,1.94 | 0.97 | 0.74,1.26 | 1.10 | 0.92,1.31 |
| < 12 years | 1.06 | 0.74,1.5 | 1.97 | 1.32,2.93 | 1.02 | 0.75,1.40 | 1.34 | 1.08,1.65 |
| Gravidity | ||||||||
| Multigravid (2–5 pregnancies) | 1.00 | -- | 1.00 | -- | 1.00 | -- | 1.00 | -- |
| Primigravid (1 pregnancy) | 0.74 | 0.65,0.85 | 1.03 | 0.80,1.33 | 0.97 | 0.79,1.19 | 0.98 | 0.82,1.16 |
| Grand multigravid (6+ pregnancies) | 0.91 | 0.58,1.42 | 1.71 | 1.04,2.82 | 2.06 | 1.31,3.23 | 1.24 | 0.92,1.67 |
| PNC adequacy (1st visit in 1st trimester) | ||||||||
| No | 1.00 | -- | 1.00 | -- | 1.00 | -- | 1.00 | -- |
| Yes | 0.88 | 0.63,1.23 | 1.08 | 0.78,1.48 | 0.74 | 0.55,0.99 | 0.78 | 0.66,0.92 |
| Marital status | ||||||||
| Married | 1.00 | -- | 1.00 | -- | 1.00 | -- | 1.00 | -- |
| Unmarried | 1.01 | 0.78,1.31 | 1.56 | 1.20,2.02 | 1.28 | 1.00,1.63 | 1.31 | 1.10,1.57 |
| Tobacco use during current pregnancy | ||||||||
| Nonsmoker | 1.00 | -- | 1.00 | -- | 1.00 | -- | 1.00 | -- |
| Smoker | 1.57 | 1.18,2.10 | 1.66 | 1.07,2.56 | 1.95 | 1.46,2.61 | 1.58 | 1.28,1.94 |
| County | ||||||||
| Wake | 1.00 | -- | 1.00 | -- | 1.00 | -- | 1.00 | -- |
| Durham | 1.04 | 0.86,1.26 | 1.10 | 0.79,1.52 | 1.03 | 0.76,1.39 | 1.22 | 1.02,1.46 |
a
Odds ratios correspond to a 20 percentage-point change (e.g., change from 20% to 40%) in tract-level percent black
b
Neighborhood deprivation based on the principal components summary of eight census items from five SES domains including poverty, education, employment, housing and occupation
Counties, NC from 1999 through 2001, stratified by neighborhood deprivation