NPPB and hydrops fetalis: CRN: Control 10.50 ± 1.84, n = 10; HF NT-proBNP < 500 pg/mL 7.77 ± 2.35, n = 13; HF NT-proBNP ≥500 pg/mL 4.70 ± 1.83, n = 10; CRO: Control 11.50 ± 0.71, n = 10; HF NT-proBNP < 500 pg/mL 10.83 ± 1.40, n = 12; HF NT-proBNP ≥ 500 pg/mL 9.00 ± 2.32, n = 11).