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Table 3 Comparison of observed and predicted probability of survival using PREP-S model at 48 hours and by 1 week after diagnosis of early onset pre-eclampsia in external datasets

From: Prediction of complications in early-onset pre-eclampsia (PREP): development and external multinational validation of prognostic models

Risk stratification (No. of women) Time External validation in PIERS cohort
Observed survival probability \( \left(\overline{S}(t)\right) \) Predicted survival probability (Ŝ(t)) Ratio \( \left(\overline{S}(t)\right)/\left(\widehat{S}(t)\right) \)
≤ 15th (n = 59) 48 hours 0.91 0.95 0.96
1 week 0.81 0.79 1.0
> 15th–50th (n = 70) 48 hours 0.88 0.89 1.0
1 week 0.62 0.60 1.0
> 50th –85th (n = 123) 48 hours 0.90 0.70 1.3
1 week 0.40 0.23 1.7
> 85th (n = 87) 48 hours 0.46 0.28 1.6
1 week 0.14 0.02 7.0