The interaction was driven by an increase in HF-HRV after intranasal oxytocin (compared with placebo) in CHR-P men (F(1,38.81) = 14.11, p = 1.00 × 10−3) but not in healthy men (F(1,40.45) = 0.40, p = 0.53). Here, OXT is linked to hydrops fetalis.