Comparison of the competing risks model for SGA with the RCOG guideline for the prediction of SGA
The variables used for the comparison are given in Table S2. The ROC curves for the prediction of stillbirth by the competing risks model combining maternal risk factors, EFW, and UtA-PI are presented in Figure 2. Prediction of stillbirth by the competing risks model was superior to that of the RCOG guideline (Table 3, Figure 2). At a screen positive rate of 21.8 %, as defined by the RCOG guideline, the new model predicted 79%, 76% and 71% of placental dysfunction related stillbirths at <32 weeks’ gestation, <37 weeks and any gestational age and the respective figures for the RCOG guideline were 42%, 44% and 40%3.