TNF and hydrops fetalis: In contrast, Chalder FS scores were positively correlated with the changes in TNF-α levels (mean: − 0.1 ± 0.3, r = 0.684, P = 0.048; Fig. 2a), the HF component of HRV (mean: − 4.3 ± 87.4, r = 0.705, P = 0.042; Fig. 2b), and the TAS-20 score (mean: − 0.4 ± 5.9, r = 0.777, P = 0.001; Fig. 2c).