However, during awake period, the correlations between HRV metrics and clinical indicators decreased observably, and HRV metrics mainly correlated with liver function indicators ALT (e.g., LF, r = 0.632, p < 0.001; HF, r = 0.628, p < 0.001) and AST/ALT (e.g., LF, r = −0.592, p < 0.001; HF, r = −0.606, p < 0.001). Here, GPT is linked to hydrops fetalis.