| Effect | Comparison* | Relative_Risk** | Confidence_Interval |
| Pregnancy Interval | <=15 mo vs >15 mo | 0.98 | (0.85, 1.14) |
| Pregnancy Interval | NA vs >15 mo | 1.36 | (1.19, 1.56) |
| BMI (>30, 25-30, <=25) | Obese vs Normal(<=25) | 0.83 | (0.67, 1.03) |
| BMI (>30, 25-30, <=25) | Overweight vs Normal(<=25) | 0.73 | (0.58, 0.91) |
| Mothers Education | <HS vs >HS | 1.04 | (0.89, 1.22) |
| Mothers Education | HS vs >HS | 1.19 | (1.06, 1.35) |
| Adequate prenatal care? | No vs Yes | 0.69 | (0.57, 0.83) |
| Medicaid | Yes vs No | 1.19 | (1.02, 1.40) |
| Mothers Race | Black vs White | 2.2 | (1.91, 2.53) |
| Mothers Race | Other vs White | 1.14 | (0.90, 1.45) |
| Marital Status, married? | No vs Yes | 1.05 | (0.93, 1.18) |
| Age of Mom | <20 vs 20-34 | 1.11 | (0.92, 1.33) |
| Age of Mom | >34 vs 20-34 | 1.48 | (1.31, 1.67) |
| Prev preg experience | 1-2 vs 0 | 0.67 | (0.58, 0.77) |
| Prev preg experience | >2 vs 0 | 0.54 | (0.44, 0.66) |
| Prev preg experience | Fail vs 0 | 1.36 | (1.08, 1.72) |
| Plurality | MultiBirth vs Singleton | 7.37 | (5.78, 9.40) |
| Prenatal screen score | High vs Low | 1.26 | (0.94, 1.68) |
| Prenatal screen score | None vs Low | 1.4 | (1.15, 1.70) |
| Smoking | Yes vs No | 1.05 | (0.84, 1.31) |
| Had WIC>=1 day during preg? | Yes vs No | 0.44 | (0.36, 0.53) |
*The Reference group for each comparison is the subgroup following the "vs." statement. |
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**The relative risk for an effect is not significant if the confidence interval includes 1. |
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