CRP and hydrops fetalis: We observed an additive interaction of hs-CRP and NLR on the risk of HF (RERI: 0.67, 95% CI: 0.12–1.34; AP: 0.14, 95% CI: 0.02–0.24; SI: 1.22, 95% CI: 1.03–1.44), which indicated that there might be a synergistic effect, but it does not exist in the female population.