TABLE 6.
Multiple Logistic and Linear Regression Coefficients Modeling the Effect of Each Covariate on the Odds Ratio of Premature Gestational Age (<37 Weeks) and Mean Gestational Age
| Logistic Regression Modeling the Odds Ratio of Premature (<37 Weeks) Birth |
Linear Regression Modeling Of Mean Gestational Age (Weeks) |
||||
|---|---|---|---|---|---|
| Covariate |
N |
Odds Ratio (95% CI) |
Adjusted† Odds Ratio (95% CI) |
Coefficient (95% CI) |
Adjusted† Coefficient (95% CI) |
| Maternal Age | |||||
| < 20 years | 173 | 1.32 (0.78 – 2.21) | 1.32 (0.78 – 2.21) | 0.32 (−0.10 – 0.74) | 0.33 (−0.10 – 0.76) |
| 20 – 24 years | 488 | 1.39 (0.95 – 2.04) | 1.39 (0.95 – 2.04) | −0.06 (−0.37 – 0.25) | −0.06 (−0.37 – 0.24) |
| 25 – 29 years | 477 | 1.0 | 1.0 | - | - |
| 30 – 34 years | 285 | 1.33 (0.86 – 2.07) | 1.36 (0.87 – 2.12) | −0.27 (−0.62 – 0.09) | −0.27 (−0.62 – 0.09) |
| 35 – 39 years | 101 | 0.61 (0.27 – 1.38) | 0.62 (0.27 – 1.41) | 0.13 (−0.40 – 0.65) | 0.14 (−0.39 – 0.66) |
| > 39 years | 31 | 1.96 (0.77 – 5.00) | 2.02 (0.79 – 5.22) | −0.67 (−1.56 – 0.22) | −0.62 (−1.51 – 0.27) |
| Maternal Race | |||||
| White | 1519 | 1.0 | 1.0 | - | - |
| Black | 19 | 1.81 (0.59 – 5.51) | 1.80 (0.58 – 5.55) | −0.13 (−1.24 – 0.98) | −0.11 (−1.22 – 1.00) |
| Other | 17 | 0.42 (0.06 – 3.22) | 0.39 (0.05 – 2.97) | 0.19 (−0.98 – 1.36) | 0.27 (−0.90 – 1.45) |
| Neonate Sex | |||||
| Male | 777 | 1.0 | 1.0 | - | - |
| Female | 778 | 0.87 (0.65 – 1.17) | 0.87 (0.65 – 1.18) | 0.17 (−0.08 – 0.41) | 0.17 (−0.07 – 0.41) |
| Water Service Category | |||||
| LHWA Only | 168 | 0.78 (0.46 – 1.30) | 0.76 (0.44 – 1.28) | −0.04 (−0.44 – 0.35) | −0.01 (−0.40 – 0.41) |
| Partial LHWA | 212 | 0.82 (0.52 – 1.30) | 0.82 (0.51 – 1.31) | −0.24 (−0.59 – 0.12) | −0.24 (−0.60 – 0.12) |
| No LHWA | 1175 | 1.0 | 1.0 | - | - |
| SES Index | 1555 | 1.02 (0.96 – 1.09) | 1.03 (0.97 – 1.10) | −0.02 (−0.06 – 0.03) | −0.02 (−0.07 – 0.03) |
†
Adjusted for all five covariates in the model. All covariates except SES Index were categorical variables with levels indicated. p>0.05 for all values. Coefficients of the linear regression models are given in weeks. Logistic regression coefficients for SES Index represent the change in odds ratio per unit increase of the covariate.