Table 3

Hierarchical logistic regression of effects of gestational age (in weeks) on failing to attain a Good Level of Development on the EYFSP after controlling and moderating for the additional effects of academic month of birth

VariableStep 1Step 2Step 3
OR (95% CI)OR (95% CI)OR (95% CI)
Academic month of birth1.17 (1.15 to 1.18)***1.17 (1.16 to 1.18)***1.17 (1.16 to 1.18)***
Gestational age (in weeks)1.09 (1.06 to 1.11)***1.08 (1.06 to 1.11)***
Interaction†0.99 (0.99 to 1.01)
 R2 (Hosmer-Lemeshow)0.0470.0500.050
 R2 (Cox-Snell)0.0610.0650.065
 R2 (Nagelkerke)0.0820.0880.088
 χ2651.7***47.2***0.2
  • n=10 337.

  • *P<.05, **p<0.01, ***p<0.001.

  • Gestational age × academic month of birth.

  • ‡Significance denotes change in model fit from previous step in the hierarchical model.

  • EYFSP, Early Years Foundation Stage Profile.