TABLE 2.
Crude and adjusted estimates of the association between tract-level percent black and preterm birth among non-Hispanic black and white women in Wake and Durham Counties, NC from 1999 through 2001
| White
|
Black
|
|||
|---|---|---|---|---|
| Model and Variables | OR | 95% CI | OR | 95% CI |
|
Crude
| ||||
| Tract-level percent blacka | 1.15 | 1.08,1.22 | 1.14 | 1.09,1.19 |
|
Adjusted
| ||||
| Tract-level percent blacka | 1.09 | 1.01,1.18 | 1.05 | 0.99,1.11 |
| Maternal age (continuous) | 1.01 | 0.99,1.02 | 1.03 | 1.02,1.04 |
| Educational attainment | ||||
| >12 years | 1.00 | -- | 1.00 | -- |
| =12 years | 1.21 | 1.03,1.42 | 1.20 | 1.03,1.40 |
| <12 years | 1.10 | 0.88,1.37 | 1.47 | 1.22,1.77 |
| Gravidity | ||||
| Multigravid (2–5 pregnancies) | 1.00 | -- | 1.00 | -- |
| Primigravid (1 pregnancy) | 0.81 | 0.72,0.90 | 1.00 | 0.87,1.16 |
| Grand multigravid (6+ pregnancies) | 1.29 | 0.95,1.76 | 1.36 | 1.05,1.75 |
| PNC adequacy (1st visit in 1st trimester) | ||||
| No | 1.00 | -- | 1.00 | -- |
| Yes | 0.79 | 0.64,0.98 | 0.83 | 0.72,0.96 |
| Marital status | ||||
| Married | 1.00 | -- | 1.00 | -- |
| Unmarried | 1.14 | 0.96,1.36 | 1.40 | 1.21,1.62 |
| Tobacco use during current pregnancy | ||||
| Nonsmoker | 1.00 | -- | 1.00 | -- |
| Smoker | 1.77 | 1.44,2.16 | 1.58 | 1.31,1.91 |
| County | ||||
| Wake | 1.00 | -- | 1.00 | -- |
| Durham | 1.02 | 0.88,1.19 | 1.18 | 1.01,1.36 |
| Dichotomized percent black | ||||
| < 25% (mean: 0.12; sd: 0.07) | 1.00 | -- | 1.00 | -- |
| >=25% (mean: 0.56; sd: 0.23) | 1.12 | 0.96, 1.29 | 1.18 | 1.00, 1.39 |
a
Odds ratios correspond to a 20 percentage-point change (e.g., change from 20% to 40%) in tract-level percent black