Risk-Adjusted Mortality Model for Singleton Infants With a BW <2000 Grams Born in California in 1992 and 1993

VariableRisk Model
OR95% CI
Female BW 500–749 g83.3463.06–110.15
Female BW 750–999 g12.228.94–16.71
Female BW 1000–1249 g6.224.50–8.57
Female BW 1250–1499 g2.271.61–3.19
Male BW 500–749 g150.72115.16–197.26
Male BW 750–999 g22.0116.61–29.17
Male BW 1000–1249 g7.355.24–10.30
Male BW 1250–1499 g2.691.89–3.82
Maternal education <8 y0.980.80–1.19
Maternal education 8–11 y1.000.87–1.16
Small for gestational age0.560.42–0.75
Hydrops nonimmune67.1728.35–159.19
Maternal complications affecting infant0.560.43–0.73
Placental hemorrage1.521.08–2.14
Highest risk anomalies73.1951.93–103.16
Moderately high-risk anomalies1.641.36–1.98
Respiratory distress syndrome0.420.36–0.50
Medicaid insurance1.321.09–1.60
HMO insurance1.110.92–1.34
No insurance1.761.31–2.37
Major teaching hospital1.391.04–1.86
For-profit hospital0.820.65–1.03
County hospital1.201.00–1.45
  • Area under the ROC curve = 0.91. Hosmer-Lemeshow test, P = .19.

    BW 1500–1999 g was the reference for the OR calculations; the OR for males in this BW interval was not different from 1.0 (1.03).