Table 3. Relative Contribution of Variables to the Multivariable Modela.
| Variable | Decrease in Log Likelihood | Relative Contribution, % |
|---|---|---|
| Birth weight | 79.4 | 36 |
| Infant sex | 31.3 | 14 |
| Antenatal corticosteroids | 18.9 | 9 |
| Plurality | 3.2 | 1 |
| Gestational age | 45.0 | 20 |
| Hospital of birth | 43.7 | 20 |
a
Values represent the relative contribution of each variable (as a proportion of the total change in model log-likelihood value) to model predictive ability. We estimated the relative contribution of individual variables to the overall predictive value by using the differences between the log likelihood of the full model and the log likelihood of a model without each variable. Relative contribution was defined as the ratio of the variable’s log-likelihood difference to the sum of the model’s 6 log-likelihood differences multiplied by 100.