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 odds | SE | z | p Value | p Value | |
| Intercept | −50 | 7.1 | −7.0 | <0.001 | 0.6 |
| Gestation (weeks) | 3.1 | 0.53 | 5.9 | <0.001 | 0.6 |
| Gestation2 | −0.044 | 0.0098 | −4.5 | <0.001 | 0.6 |
| “Noisy” weight z score | 0.25 | 0.054 | 4.6 | <0.001 | 0.09 |
| “Noisy” weight z score2 | −0.096 | 0.026 | −3.7 | <0.001 | 0.4 |
| Area under ROC curve | 0.882 | ||||
| Hosmer–Lemeshow test p value | 0.2 | ||||
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ROC, receiver operating characteristic.
