NPPB and hydrops fetalis: Patients were divided into 3 subgroups to compare the association of sST2 and NT-proBNP levels according to different LVEF levels: HF with reduced ejection fraction (HFrEF, left ventricular EF [LVEF] < 40%), HF with mid-range EF (HFmrEF, 40% ≤ LVEF ≤ 49%), and HF with preserved EF (HFpEF, LVEF ≥ 50%).