Table 4

Coefficients of logistic regression models predicting survival to term, based on Northern and Trent preterm babies alive at onset of labour or delivery

Northern region 2000–3 and Trent region 2000–4 (n  =  4838)Northern versus Trent
Log oddsSEzp Valuep Value
Intercept−507.1−7.0<0.0010.6
Gestation (weeks)3.10.535.9<0.0010.6
Gestation2−0.0440.0098−4.5<0.0010.6
“Noisy” weight z score0.250.0544.6<0.0010.09
“Noisy” weight z score2−0.0960.026−3.7<0.0010.4
Area under ROC curve0.882
Hosmer–Lemeshow test p value0.2
  • ROC, receiver operating characteristic.