Figure 1.
Rates for term and preterm cases of cerebral palsy by Z-score of weight-for-gestation: mild and more severe cases separately. Z-score derived using fetal growth standards. Patterns <32 weeks gestation differ when neonatal growth standards are used. Babies born <32 weeks (the basis for neonatal standards) may be abnormally grown however and the implications of this are discussed elsewhere.1 Rate ratios by Z-score band and their statistical significance are given for the more severe cases in table 1.