Table 2

Coefficients of logistic regression models predicting survival to term, based on Northern and Trent preterm liveborn babies

Northern region 2000–3 (n  =  1434)Trent region 2000–4 (n  =  3314)Northern + Trent region (n  =  4748)Northern versus Trent
Log oddsSEzp ValueLog oddsSEzp ValueLog oddsSEzp Valuep Value
Intercept−5513−4.2<0.001−499.2−5.4<0.001−507.5−6.8<0.0010.2
Gestation (weeks)3.60.993.6<0.0013.10.694.5<0.0013.20.565.7<0.0010.7
Gestation2−0.0540.018−2.90.003−0.0440.013−3.4<0.001−0.0460.010−4.4<0.0010.7
Weight z score3.11.42.20.032.50.882.80.0042.50.733.4<0.0010.004
Weight z score2−0.170.075−2.30.02−0.190.031−6.1<0.001−0.180.028−6.4<0.0010.8
Gestation by z score−0.110.051−2.10.04−0.0710.032−2.20.03−0.0750.027−2.80.0050.5
Male sex−0.420.19−2.20.03−0.160.13−1.30.20.2
Area under ROC curve0.8790.8870.882
Hosmer–Lemeshow test p value0.30.50.2
  • ROC, receiver operating characteristic.