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ROC curves in subgroups according to GA at delivery for the prediction of adverse perinatal outcome of UA PI (black), MCA PI (red), CPR (orange) and UA PI plus CPR combined (blue) for: GA at delivery <34 weeks (n = 836), GA at delivery 34–37 weeks (n = 1085) and GA at delivery ≥37 weeks (n = 19 704).
