CRP and placenta praevia: A smooth curve and the result of generalized additive model show that the relationship between GA and incidence of CRP ≥ 8 mg/L was non-linear after adjusting for maternal fever, placenta previa, antenatal antibiotic use, PROM, pregnancy hypertension, gestational diabetes, ICP, meconium-stained amniotic fluid, antenatal steroids, maternal autoimmune diseases.