Fig. 3From: Second trimester maternal serum D-dimer combined with alpha-fetoprotein and free β-subunit of human chorionic gonadotropin predict hypertensive disorders of pregnancy: a systematic review and retrospective case–control studyROC curve for the prediction value of GH, PE, or SPE. a ROC curve for the prediction of GH; b ROC curve for the prediction of PE; c ROC curve for the prediction of SPE; d ROC curve for the prediction of HDP (GH + PE + SPE). DD D-dimer, AFP alpha-fetoprotein, free β-hCG free beta subumit of human chorionic gonadotropin, GH gestational hypertension, PE Preeclampsia, SPE severe preeclampsiaBack to article page