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79% and included respiratory symptoms (49.14%), vomiting (38.79%), retinopathy of prematurity (ROP, 25.86%), hypoxic-ischemic injury (3.45%), re-hospitalization (26.72%) and sudden death (0.86%). Respiratory diseases constituted the most frequent complication. The prevalence of GER in BPD was 42.24% and included acid GER (18.10%) and duodenogastroesophageal reflux (DGER, 24.14%). Risk factors for respiratory symptoms were gestational age ≤30 weeks (odds ratio, OR=3.213; 95% CI, 1.221-8.46, birth weight 7 days (OR=4.952; 95