Research Article
Survival of Preterm Singleton Deliveries: A Population-Based Retrospective Study
Table 4
Adjusted hazards ratios (HR) for the association between pregnancy risk factors and early mortality among singletons, Missouri, 1978–2005.
| | Predictor | Neonatal death | Postneonatal death | Infant death | | HR (CI) | HR (CI) | HR (CI) |
| | Marital status | | | | | Married | 1.00 | 1.00 | 1.00 | | Unmarried | 0.88 (0.78–0.99) | 1.27 (1.12–1.45) | 1.02 (0.94–1.12) | | Maternal age | | | | | Less than 18 yrs | 1.13 (0.89–1.43) | 0.95 (0.72–1.25) | 1.02 (0.85–1.22) | | 18–35 years | 1.00 | 1.00 | 1.00 | | More than 35 years | 0.99 (0.86–1.16) | 0.89 (0.71–1.12) | 0.97 (0.86–1.10) | | Maternal race | | | | | White | 0.97 (0.86–1.10) | 0.77 (0.65–0.90) | 0.90 (0.81–0.99) | | Black | 1.00 | 1.00 | 1.00 | | Other | 1.02 (0.73–1.43) | 0.60 (0.37–0.97) | 0.83 (0.63–1.09) | | Infant sex | | | | | Female | 0.85 (0.78–0.93) | 0.69 (0.62–0.77) | 0.79 (0.74–0.84) | | Male | 1.00 | 1.00 | 1.00 | | Maternal educational | | | | | Less than 12 years | 1.00 | 1.00 | 1.00 | | 12 years or more | 0.91 (0.80–1.04) | 0.79 (0.69–0.92) | 0.86 (0.78–0.94) | | Paternal educational | | | | | Less than 12 yrs | 1.00 | 1.00 | 1.00 | | 12 years or more | 0.86 (0.76–0.97) | 0.69 (0.61–0.80) | 0.79 (0.72–0.86) | | Maternal smoking | | | | | Yes | 0.90 (0.81–1.00) | 1.69 (1.50–1.91) | 1.17 (1.08–1.27) | | No | 1.00 | 1.00 | 1.00 | | Type of delivery | | | | | Caesarean section | 1.53 (1.40, 1.68) | 1.39 (1.22, 1.58) | 1.37 (1.27, 1.48) | | Vaginal birth | 1.00 | 1.00 | 1.00 | | Gestational age (week) | 0.87 (0.86–0.89) | 1.07 (1.04–1.10) | 0.91 (0.90–0.93) | | Birth weight (gram) | 0.9992 (0.9991–0.9993) | 0.9992 (0.999–0.9993) | 0.9992 (0.9992–0.9993) |
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