A Population Based Study on Very Low Birth Weight, Based on the 2005 Birth Cohort of Florida

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The calculator is based on fitted log-linear model, which is built by SAS software. Only significant factors in the model are included in the calculator. The calculator will calculate the probability and odds of the outcome.

Probability & Odds Calculator for Very Low Birth Weight in 2005

Pregnancy Interval : <=15 moNA>15 mo BMI (>30, 25-30, <=25): ObeseOverweightNormal(<=25) Mother's Education : <HSHS>HS Adequate prenatal care? : NoYes Medicaid: YesNo Mother's Race : BlackOtherWhite Marital Status, married? : NoYes Age of Mom : <20>3420-34 Prev preg experience : 1-2>2Fail0 Plurality : MultiBirthSingleton Prenatal screen score : HighNoneLow Smoking : YesNo Had WIC>=1 day during preg? : YesNo

Statistical Model Formula for Predicted Rates

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The calculator is based on fitted log-linear regression model, which is built by SAS software. Only significant factors in the model are included in the calculator. The calculator will calculate the probability and odds of the outcome.

Predicted Rates for Very Low Birth Weight in 2005

Select up to 5 factors. All Risk Factors: Selected Risk Factors: Smoking Drinking Pregnancy Interval Mother's Education Marital Status, married? Mother's Race Prev preg experience Age of Mom Sex of Baby Adequate prenatal care? Medicaid Prenatal screen score Had WIC>=1 day during preg? Plurality BMI (>30, 25-30, <=25)

Adjusted Relative Risks and 99% Confidence Intervals for Very Low Birth Weight in 2005

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. **The relative risk for an effect is not significant if the confidence interval includes 1.