CRP and Patent ductus arteriosus: The conditions of the two groups in terms of sex, gestational age, birth weight, Apgar score, IVH, highest serum C-reactive protein (CRP), ibuprofen treatment rates in patent ductus arteriosus (PDA), incidence of retinopathy (ROP), BPD, mechanical ventilation (> 96 h), vasoactive drug use, and fasting days are shown in Table 1.